GTX 660 SLI or 760 or 770?

Sell your GTX 560 and get the 660. Both perform similarly, but single card is almost always better than dual card set-ups because of less driver problems, less heat output, less power consumption, and less stuttering. NVIDIA is keeping quiet on the 7xx series so it might not come out soon.

Also, you can only utilize the RAM of one graphics card in SLI, so you'll be stuck at 1GB. And I believe tesselation will work better on the newer card. I do agree on getting a new motherboard and RAM to support all the new features since your CPU will still be supported.

You won't experience much of an bottleneck when the CPU is overclocked. USB 3.0 is a lot faster than 2.0, and you'll need SATA 6Gbps in newer motherboards to utilize fully the speed of your hard drive. And go buy an SSD for your boot drive while your at it so your boot-up and loading times for applications will be a lot faster.

The motherboard may give you a bit more frames but you won't really feel it. It would be better to choose a motherboard with the features I stated above, with 1-2 PCI-e slots, good power delivery for overclocking, good build quality, and be done with it to save a few bucks. The little white thing isn't really important if you know how to plug in front panel connections to your motherboard.

Just make sure you have enough cables for your components, the I/O shield, and the manual and that's a good deal. And get a SATA DVD Burner because there are no more IDE ports in newer motherboards. Happy upgrading!

EDIT: If you can sell your 560 at a high enough price, get the 660 Ti or an HD 7870 Tahiti LE. Always go for the best you can afford :).

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