I'm pondering on doing both.... I'm wanting a 661 anyway, and that and a p55 ftw are ~$400 at the egg. By the time a lower end 32nm 1366 drops I'll be ready.
I could go with a gpu instead of 1156, but I want to play in 6ghz land NOW.... it just seems like it would feel more rewarding to beat up on i5 chips. Plus I'll have an excuse for dual bench setups...