I just wanted to pipe up and say that I love my eyetv 250+ When I first hooked it up I told it to do a through scan of all the stations that were available to me and I actually get a number of digital cable channels that include the very few HD channels that are offered by my cable provider.
It may seem like a bit much to have the HDTV in your room but it's also a matter of taking a regular TV out of your room then. I personally have the 24" in my bedroom almost directly across from my bed and it's a perfect size, if you can swing it I'd highly recommend it as it's a great way to record shows that you want to watch and won't be around for. It really acts better than the DVR that I have through my cable provider, esp. since it will output it to an iPod friendly format.
Good luck thinking this one through.