intel atom's are too weak to be used as a htpc source to get full playback (dxva & hardware acceleration) you need a video card that supports it.. i've build a setup and is under 10k (maybe 15k if parts are brand new)
my build:
- 775 board
- celeron-L series (35w max)
- ati 5450 low-profile (20w max, h264, dxva 1 & 2 accelaration)
- 2gb ram single stick (less power requirement if using single stick)
- 500gb western digital energy saver
+ 5k for a blueray drive
digital audio pass thru hdmi (thanks to ati) no need for optical outs
around 60-70w pag full load