Today, sandy bridge, probably 2500K is the way to go.
The Z68 chipset is due soon, so you should see that by june.
22nm sandy bridge, is 1Q2102 probably.
socket 2011 , the follow on to 1366 may be out by year end, but will be more for servers and workstations than for gaming.
Bulldozer is scheduled for june. It remains to be seen if it will finally launch, and if it will be competitive with Intel.
I do not expect anything much in graphics untill late in the hear, or next year.
In the mean time, I suggest you keep abreast of the news.
Start shopping for the things that will not change, like a case, or psu.
As with all things electronic, price performance gets continually better. Particularly for SSD's.
Get electronics as late as possible.