I have a pretty similar setup, and personally I've decided to wait a little longer, possibly for the Nvidia 800 series next year. As always, depends on the games you want to play, of course.
When it comes to the CPU, as far as I know (and have been told in other topics), it should still be solid for a few more years since the newer Intel CPUs focus more on power efficiency than increased performance. And yes, I'm about 90% sure you'd need a new motherboard to get a newer CPU, unfortunately.
Currently playing: Crusader Kings 2 (PC), Rayman Origins (PC)
nice... do u think i should buy a new cooling system so i can overclock ? i am using stock right now but im not sure if it'll give me a better boost. I have been considering it but I am not sure if it is worth it lol. I imagine overclocking would also give me more power to run games ?
MSI P67A-GD65 (B3) | INTEL CORE i5 2500k | ASUS ENGTX560 TI DCII | G.SKILL Ripjaws X Series 8GB