Comcast, St. Paul, MN Currently have a series 2 w/lifetime and want HD My 40 hour frequently fills up but I don't keep things long term, just until I watch them. I use TTG to transfer some stuff, but not for much longer, as my main reason was to watch Law and Order in order, but I have all episodes now so I will slowly be deleting as I watch. Very few movies will be kept (I have a Blu Ray player and Netflix), but probably some Discovery HD stuff for multiple viewing, and for the most part for television shows. Nothing will be recorded in SD, as I will still have my series 2 connected for that. Sound quality is very important (not sure if there is a "real" difference, but if someone has noticed it let me know), picture quality is very very important. Both tivos will be connected to a 42" 1080p Panasonic Plasma. That being said... should I get the series 3 or the HD? Thanks for the insight!!!