CPU: http://www.newegg.com/Product/Product.aspx?Item=N82E16819106013&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=3938566&SID=
Get that cpu with the optical drive and you'll save 8.
PCPartPicker part list:
http://pcpartpicker.com/p/mXSu
Price breakdown by merchant: http://pcpartpicker.com/p/mXSu/by_merchant/
Benchmarks: http://pcpartpicker.com/p/mXSu/benchmarks/
Motherboard: Asus F1A55-M LE Micro ATX FM1 Motherboard ($28.84 @ NCIX US)
Memory: AMD Entertainment Edition 2GB (1 x 2GB) DDR3-1600 Memory ($8.45 @ Amazon)
Storage: Western Digital Scorpio Blue 250GB 2.5" 5400RPM Internal Hard Drive ($44.99 @ Newegg)
Case: Logisys CS2006BK ATX Mid Tower Case w/480W Power Supply ($44.98 @ NCIX US)
Total: $127.26
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-11-08 15:38 EST-0500)
So when you get that cpu, and pair it up with that optical drive, it's short of $170 barely, but I made it.
This is the cheapest I could go.