Hey, did someone say my name? You know, I am a home theater buff. I suppose my secret was bound to come out someday!
Oz, what do you mean by "Media Center Build"? This is not what most people do for an HTPC. Usually, it's a low-profile case with fewer fans, to decrease noise. For something that will go in the living room, or wherever your home theater is, most people want quiet. However, I can see from your parts list that the usual HTPC is not what you have in mind. And, where is the Blu-ray Disc (BD) player/writer?!? :-)
Anyway, back to the parts. Even though you are not a gamer, I think you should take one step up on the graphics card to one with a 3850 GPU at least. A 3800 series GPU will give more oomph, not just for playing games but also for accelerated playback of high-def video. Looking at the specs at ATI, the 3650 does seem to have a lot of good features so maybe it's good enough. The Rosewill PSU doesn't mention an 80plus certification. The specs do say >80% efficiency, so why would they not go for certification? Then again, I don't know if 80plus is meaningful or just marketing hype. I need to investigate that Asus TV Tuner card. Other than that, it all looks good.
Rick, I hope you're not holding your breath waiting for the i7 from Intel. I wouldn't want you to suffocate.