Vista + Comcast = PVR & MCE Goodness

I have been trolling posts on several sites for the past few months, and can
still find no solution to turning my Vista PC into an entertainment hub IN
HD. I have Comcast digital cable (stupid monopoly that they are), a Vista
Ultimate PC, and a HD TV. Do I still need to wait forever for a graphics
card/TV Tuner solution that allows me:
- To use the Vista MCE on my TV
- Record and Watch Recorded TV from my PC on my TV in glorious HD

That's it! I had thought this problem would have been solved, but the only
answers I see involve watching SOME content in HD, through an OTA antennae
(not great for the city) in addition to running analog content for several
other channels. Has anyone cracked this yet? The idea of plunking down more
cash for a ton of hardware, vs. one magical tuner card is tough.