What should I get?

[evolutioneer]

Hello everyone.

I have this little problem: I cannot choose a motherboard, I just don't know what PCIe is better, what's compatible with what, that , etc.
So I'd like to hear what you'd recommend me
Note: this is for gaming, a high-end PC attempt , budget around 2000$-2200$, not going over $2300

I posted this in motherboard, cause this is the piece of equipment that pretty much decides what the other parts are going to be.
This is what I have so far:
-[CPU] i5-3570k or maybe i5-2500k
-[GPU]GainWard nVidia GTX680 Phantom 4GB (or a Sapphire Radeon HD 7970)
-[PSU]Corsair 750W(because I'm planning on doing SLI/CF later)
-[RAM]Corsair 16GB 1600MHz 2x8GB
-[Case]Coolermaster HAF 912/932(hope two GPU cards+the rest fit in, didn't calculate, lol) or NZXT Phantom White or in best case a Corsair Obsidian 800DW OR Antec 902
-[Coolers]GPU&CPU Coolers + Fan ; Also, what coolers would you guys recommend me?
-[HDD]500GB 7,200RPM Western Digital
-[Motherboard] I thought of ASRock Extreme3 Gen3, or ASRock Fatal1ty Z68 Professional Gen3

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Also, what GPU should I get? I mean, between nVidia's GTX680 and Radeon HD 7970? I'm planning on SLI/CF later on, but not now. I also heard that there'll be GTX685 released, or something, having a 30% boost over 680 .
Shall I change/remove/add anything, so I can achieve a better build?
Is the case good enough for SLI/CF configuration? I'm pretty new into this.
Is the PSU good enough? Or is it too much?
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Thanks a lot!! (in advance)

 

[abekl]

For the PSU, make sure to get it from Corsair's enthusiast or gamers series.

For coolers, no need to look beyond the CM 212 EVO

Stay away from Asrock and MSI for the MB. Stick with top tier manufacturers such as Gigabyte and Asus.

GIGABYTE GA-Z77X-UD3H
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128544

or

ASUS P8Z77-V LK
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131837