Xeon e3 1220 3.1 ghz vs i5 2320 3ghz

Motherboard not for overclocking 1155.
The gtx 770 2gb.
There are two options for buying CPU.
The first xeon e3 1220 3.1 ghz for 4000 with good reviews. Second, buy on Craigslist i5 2320 for 4700. That will be cheaper and more reliable?