Rumors are rumors. What is now on the market is fact. You want to buy something from rumors or from facts ?
Buy a Sandy Bridge quad core. The six core cpu's are good if you work with them ( video rendering, 3D and other heavy programs who need calculation power).
i agree. however there has been some testing done prior to RTM.
Core i7 3770S 65W quad up to 27 percent faster http://www.fudzilla.com/home/item/26045-core-i7-3700s-65w-quad-up-to-27-percent-faster
but back to the OP question; with what appears to be the improvement of ivy bridge (socket 1155 like sandy) and haswell next year (LGA 1150) i am not sure that sandy-e (LGA 2011) won't get lost in the dust like the 1366s
if you need/want something NOW getting a z68 motherboard that will support ivy with a bios update with a i5 2500k (that can overclock easily) may be worth your consideration.