System Usage from Most to Least Important:
HTPC to record video from cable card USB tuner and playback on HDTV, Playback of BD-Rom movies, quiet, small
Parts Not Required: Keyboard and mouse, cablecard tuner (Have Hauppague WinTV-DCR-2650), BD-DVDROM drive (Samsung)
Preferred Website(s) for Parts: Newegg
Parts Preferences: by brand or type: Low cost but not crap
SLI or Crossfire:No
Monitor Resolution: 1920x1080
Additional Comments: Quiet and small preferred. Will use Windows 7 Ultimate as O/S, need a remote as well. Forgot to add will be using a wired connection to my router/cable modem so don't need wireless.
I know this is above your budget, but the fact that harddrive prices are really high right now makes this significantly more expensive than just a few months ago. If you need to shave a few dollars off I think the best thing would be to get a smaller hard drive or get a slower processor. I chose this processor because its got HD3000 graphics, but you can get this one with HD2000 graphics (slightly worse) for about $15 less.
Also, this MOBO doesn't have USB 3.0, but I chose it to lower cost. You also can't overclock but this is a HTPC so I don't think that is likely.
I didn't go for an HTPC case because I couldn't find anything that were cheap and came with a power supply. The case and power supply that I've chosen are both very good quality. The PSU is Antec Earthwatts.