The fx 8350 is a pretty good choice. Here are some parts that would work together.PCPartPicker part list
/ Price breakdown by merchant
/ BenchmarksCPU: AMD FX-8350 4.0GHz 8-Core Processor
($179.00 @ Amazon) CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
($29.98 @ OutletPC) Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard
($94.23 @ Amazon) Total:
$303.21(Prices include shipping, taxes, and discounts when available.)(Generated by PCPartPicker 2014-04-15 15:18 EDT-0400)
The stock cooler on the fx-8350 is not great so I added a good cpu cooler for $30. The motherboard is close to the minimum I recommend, there are many worse ones and many better but the Asus M5A97 R2 is good.