New Micro ATX build, Help with GPU?

[Nyq]

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-3770K 3.5GHz Quad-Core Processor ($229.99 @ Microcenter)
CPU Cooler: Corsair H80i 77.0 CFM Liquid CPU Cooler ($89.99 @ Amazon)
Motherboard: Asus Maximus V Gene Micro ATX LGA1155 Motherboard ($199.98 @ SuperBiiz)
Memory: Corsair Dominator Platinum 16GB (4 x 4GB) DDR3-2133 Memory ($249.99 @ Newegg)
Storage: Western Digital Caviar Black 2TB 3.5" 7200RPM Internal Hard Drive ($152.49 @ Amazon)
Storage: Samsung 840 Pro Series 256GB 2.5" Solid State Disk ($219.99 @ Amazon)
Video Card: Asus GeForce GTX Titan 6GB Video Card ($1006.13 @ Newegg)
Case: Fractal Design Define Mini MicroATX Mini Tower Case ($112.78 @ Newegg)
Power Supply: Corsair Professional Gold 850W 80 PLUS Gold Certified ATX12V / EPS12V Power Supply ($149.99 @ Amazon)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.98 @ Outlet PC)
Total: $2501.31


I'm pretty set on most the parts in this build; however when it comes to the GPU i've been reading mixed reviews with the titan. I'm going to be using a 2560 x 1440p Resolution for gaming (27inch) with this resolution would it be better to get a GTX Titan, GTX 680 x2 SLI or just a single GTX 690?

and also depending on the choice of GPU is an 850 watt too much? would a 750 work?

Thanks!

[noteworthynerd]

I always recommend going with the single GPU solution to avoid complications that still exist with SLI (e.g. 2 680s) or dual GPU cards (e.g. 690), so a single Titan gets my vote. That should be more than enough to power 2560x1440.

And 750W is overkill, get a decent 500-600W PSU like the SeaSonic M12II 520 and you'll still have plenty of headroom.

[Nyq]

I always recommend going with the single GPU solution to avoid complications that still exist with SLI (e.g. 2 680s) or dual GPU cards (e.g. 690), so a single Titan gets my vote. That should be more than enough to power 2560x1440.

And 750W is overkill, get a decent 500-600W PSU like the SeaSonic M12II 520 and you'll still have plenty of headroom.

Thanks for the quick reply, and the help!