CPU: Intel Core i5-2500K @ 4.2 Ghz
Mobo: MSI P67-GD65 (B3)
GPU: EVGA Nvidia GeForce GTX 560 ti (Super Clocked)
Ram: 16GB (2 x 8GB) G.Skill Sniper Series 1600
HDD: 1TB - Samsung SpinPoint F3
Case: Corsair 500R (BLK)
PSU: Corsair TX850 V2
Monitor: 24" Sony Playstation 3D LED Display 240Hz and 23" Acer LED something
Mouse: Logitech G9x
KeyB: Logitech G105 (MW3 Edition)
HS: Cooler Master Hyper 212 Plus
The GTX 560 ti is excellent but I was wondering if I should go SLI or get just one really good GPU in the future. What one GPU runs on par with SLI GTX 560 ti's? I read somewhere that it's almost as good as one 670 or 680, but I'm not sure exactly.
If I choose the GTX 600 series route, is it recommended to get a mobo that supports PCI express 3.0?
Also, if I were to upgrade to the GTX 670, will the i5-2500K be a bottleneck or vice-versa?
Your GTX 560 Ti is enough for gaming. So, you should wait until next gen GPUs arrive.
Next gen GPUs will be better. Or else when next gen will release the price of these old ones will drop, then you can easily buy it.
Well, seeing on how the 560 ti is still working superbly for you, I recommend actually waiting until the next line of GPU's come out, when those come out, you will have even more money, honestly I think your build is pretty solid.