CPU and graphics: A6-3500 $69.99http://pcpartpicker.com/part/amd-cpu-ad3500ojgxbox
Motherboard: Gigabyte GA-A55M-DS2 $54.98 after MIRhttp://pcpartpicker.com/part/gigabyte-motherboard-gaa55mds2
RAM: Crucial DDR3-1866 9-9-9-24 1.5V 2x2GB BLT2KIT2G3D1869DT1TX0 $39.99 after MIRhttp://pcpartpicker.com/part/crucial-memory-blt2kit2g3d1869dt1tx0
HDD: Western Digital Caviar Blue 500GB 7.2KRPM $55.99 WD5000AAKXhttp://pcpartpicker.com/part/western-digital-internal-hard-drive-wd5000aakx
Case: Rosewill R379-M Micro-ATX slim-line w/300W PSU $49.99http://pcpartpicker.com/part/rosewill-case-r379m
DVD/CD drive: LG GH24NS90 CD/DVD burner $16.99http://pcpartpicker.com/part/lg-optical-drive-gh24ns90
total:$271.93 after $10 MIR
What do you think of this? It should perform excellently as an HTPC. If you want a Blu-Ray drive instead of a DVD drive, that'll be just slightly out of budget unless you go down to a 250GB Caviar Blue hard drive and an inferior motherboard.