I'm (finally) looking to make the jump to HD soon with a TiVoHD and have read quite a few posts from members who have Series 3 or TiVoHD's and also have a Comcast HD box on the same outlet for the purpose of receiving OnDemand (for a minimal extra fee?). Before calling Comcast to upgrade my service, I was just curious how you came to arrive at this setup. Did you have an HD box and then called for cable cards or vice versa or did you just call and request the HD box and cards at the same time? Given some of the horror stories I've read, the latter seems like it would severely confuse a CSR. Not sure if this is a stupid question or not...I'm just trying to make the process as easy as I can and avoid unnecessary aggravation with Comcast. Any tips, suggestions, or information is appreciated.