Yeah it's a hard one, 1156 vs 1366.
1366 does have triple channel memory too and an i7-920 overclocked to 3.8 makes for a killer setup.
Really you want to be in the 1366 camp if you want access to the higher end processors. Which is the main reason I'd be likely to jump to this platform.
For the next few months I'll be sticking to 775 though, and may do a quad overclock before moving to i7/i9 (unless AMD brings out something super awesome before then, and yes, if AMD has a better product for my budget I WILL switch).