This classic CPU is now back down to more decent price from the crazy high of $100+. It's not the most efficient compared to the 2011 v2. If it was closer to $100 i would definitely recommend v2, either 2660 or 2670 v2, but now it's back to under $70, it's not bad deal.
Intel Xeon E5-2670 2.6 GHz 8-Core Processor SR0KX LGA2011 115W CPU Matched X79 | eBay
Intel Xeon E5-2670 2.6 GHz 8-Core Processor SR0KX LGA2011 115W CPU Matched X79 | eBay