If you're worried about your CPU holding your gaming performance back than you should relax.You will gain abosolutely nothing in terms of FPS from upgrading to a new Core i5 or even i7 (unless you play battlefield 3 with 64 people).
But if gaming isn't the reason why you want to upgrade your CPU/MB then you should look into buying a Core i7 and a Z77 motherboard.
The CPU you should buy is the Intel Core i7 3770K
As for the motherboard, if you don't want to skimp on quality and want the best there is (within a reasonable budget) i highly reccomend those two models.
Well my i7 920 is from around 2008 or so.. (idk) Im just looking for a upgrade to something newer and a little bit more performance. My Motherboard is getting old too so I'd rather by a socket 1155 then one that fits my CPU.