Sad that TiVo seems to be sinking, but it isn't the best DVR. I think you only problem is the 150" screen. There just aint a lot of stuff that is gonna look good blown up to that size. Let me tell you, even the OTA local HD's around here has gone DOWN in PQ because they are still stuffing even MORE channels on the channel spectrum. I have seen some Yucky glitches on occasion. Yes, sometimes they use a different channel frequency and then re-map it so it appears on the guide as at another location, but I can tell you that the big O&O's here are, in fact, using the same ONE frequency to stuff more "digi-net" channels and Main HD PQ has suffered.
OK, you are right. It is pretty bad in finding a replacement for TiVo. The only other DVR I would recommend is Dish's Hopper 3, overall, superior to ANY TiVo:
16--yes SIX-Teen--sat tuners;
2 OTA tuners (with OTA USB module); Option to NOT subscribe to LIL Locals via Sat and use OTA tuners exclusively, but can NOT use Prime-Time Anytime with OTA tuners because only 2 OTA Tuners, but Auto-Hop (Auto Commercial Skip) DOES function for OTA recordings, as well.
Prime-Time Anytime: Automatically records Prime-Time programming of all 4 Big broadcasters (CBS, NBC, ABC, and FOX) using only ONE Tuner (meaning that PTAT leaves 15 sat tuners and both OTA tuners available for use) for as many or few days of the week and for as many or few of the big 4 you choose and saves content for at least 8 days, but also provides for users saving episodes or entire series (this is a handy feature when others recommend or want to watch such content not knowing until after airing of its availability).
On Demand content with internet connection: several TV series and movies can be streamed or saved to HDD for viewing such as recent or long past episodes of TV shows, and movies connected to channels on your subscription levels.
Picture in Picture of different size and position and side by side with Swapping between channels in full picture mode and includes "Bar Mode" providing 4 different channels displayed on the screen at one time;
The Joey client TV watching experience does EVERYTHING (except PIP features) that the Main Hopper DVR provides, UNLIKE TiVo Mini Clients and their limitations;
Joeys can have their own complete independent experience including separate FAVORITE / Custom (4 user defined options) channels and EPG theme settings along with FULL Timer/Schedule controlling, etc. unlike Mini clients;
UNLIKE TiVO, the DVR and each Joey client will have its own, seperate marked place to RESUME watching a DVR playback recording--SORELY LACKING on TiVo. This means as many people/locations can watch the SAME recording and later RESUME watching where they left off, not where others have left off and NOT affect others RESUME points, and if you change locations to continue watching on a different Joey or the DVR, you are presented with a LIST of names/locations so that you can choose the location/DVR/Joey to RESUME so that YOU can continue from the point YOU left off, not where others left off.
Custom Folders you name and can set for any recordings to automatically be saved there in addition to default Series folders;
Maximum of 7 TV's supported at any ONE time, meaning that you can have MORE than 7 TV's on your system, but the 8th viewer will have to wait for the 7th viewer end their session;
If all 16 sat +2 OTA tuners are in use, and you don't want to view any of the channels being recorded or being viewed or recorded Live, the viewer can still view DVR recordings or On Demand content.
An option for Shared Viewing if 16 sat +2 OTA tuners all in use. Just select one of the tuners with the programming you wish to view.
For LIVE TV, continue watching in other room: Turn off TV in one room and and continue watching in another room. The DVR or Client in the first room will stay on for 5 minutes allowing you to turn on TV and DVR or Client on in the 2nd room, then select JOIN the tuner with programming you wish to continue watching live and DVR/client in other room will automatically enter stand-by mode. When JOIN is selected, the buffer still has what was viewed just as if you were still watching it on the first room; no need to press record;
You have Shared Viewing by selecting JOIN at as many locations as you wish and the very same content is displayed on all the TV's, truly MIRRORED with commands such as skip etc. affecting all displays as a true MIRROR experience. At any of the Mirrored TV's, just tune to a different channel, access the DVR recordings, or On Demand and that Mirrored TV will continue on its OWN experience without affecting the other Mirrored TV experiences.
Option to buy Hopper and clients and have reduced monthly fees.
Apps on DVR and Joeys for sports (including on-screen notification that a game starts soon after setting up your preferred teams in the app)/Weather/Netflix/Amazon Prime: While connected devices are still the best for streaming services, Hopper and Joey are more reliable for streaming Netflix, etc. than TiVo, BUT I never bother with Dish for streaming such services because the connected devices are still BETTER at that experience.
There is probably more, but that is all I can think of off the top of my head. One bad thing is that Dish uses TiVo's awful EPG data services, so at least you can feel at home with that.
The one thing is, unless your projector/TV is up-scaling to 4K (really UHD), I don't think the picture being blown up to 150" is gonna look that great. I've seen what a big screen UHD up-scaling can do with the HD and it is quite an enhancement, but without it, I don't know. Good Grief, even typical DVD at USA 5.0Mbps won't look good at 150", but maybe DVD at UK 10Mbps, although now the Brits are producing DVD's at the lousy 5Mbps as we do.
MY PQ with Dish is fine with my 55" and the proper settings of the TV after using an Blu-ray calibration disc to get me to a good starting point, and then tweak from there to my liking, which is usually lots of detail. I can not say how good or bad it will look blown up to 150"
So, otherwise, you are out of luck. There is just nothing as good as TiVo or the Hopper 3. Everything else if really just a disappointment. Despite my ranking TiVo as second-best DVR, it is an EXCELLENT DVR--at least S1-S5 TiVo's--and I am really heart-broken that I (well, all of us) are going to lose our use of it by TiVo by moving the DVR biz off to the other patent division. While I use TiVo exclusively for OTA, I feel like at some point not too far off, they will brick my TiVo's. TiVo is easily the best OTA DVR--EVER! If the previous Administration had simply stood by the Cable Card mandate, we would probably have a much better chance TiVo being in our lives for more than a bit longer, anyway. Well, good luck, and please let us know what you end up doing.