I would wait till April and get sandy-bridge otherwise you going to waste a lot of money for less performance.
The OP is very aware of the Cougar Point chipset issue... this is designed to be a stop gap measure until Ivy Bridge is ready.
I'd look to find the least expensive CPU/Mobo combo that is compatible with the rest of the components with your future system. AMD is generally a better bang for the buck solution... Newegg currently has an Athlon II X3 450 (3.2 GHz) for $80. A ASUS M4A79XTD EVO is $84 after MIR. There are a couple 880G Asus boards for less than $100 too... It has DDR3 and PCIe... so the RAM and GPU for your future system would work. If you're planning on a LGA2011 system, and you're looking to have matched quad channel RAM, this board maxes out at 16GB (4x4GB)... Most reviews I've read say that the triple core is good enough for most gaming. Its a modern design, so it should get out of your way enough for the half a year you're using it...