I would also like to add one thing, that Gryz's post reminded me of in regards to the motherbaord
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Lets assume you may want to OC in the future, the K series is a good choice. (as already mentioned)
But, in regards to the Motherboard, something to consider.
Memory Controlers, PCI Express lanes, etc have moved onto the CPU itself. Used to, these were parts of the motherboard, and a high end motherboad was best for good overclocking, and overall performance.
Thats not really these case anymore since most everything is on the CPU & results will be highly dependant on the CPU itself -- although the motherboard does matter to a degree, its just not to the extent it once was.
So, I completely agree.
Whether you plan to OC or not, just find yourself a decent motherboard, that offers the features you need and is appealing to YOU.
For example, no point getting one with 5 PCI Express Slots and a NF200 chip, if you have no intentions of running more than 1, possibly 2 Graphics cards. Its overkill if you have no intentions of a Tri-SLi setup, and run just as well as most other boards.
ASUS, eVGA, Gigabyte would be my recomendation, though eVGA SLI line is my personal preference for P67/z68.
They offer less feature than most others, (such as extra SATA ports)
But I have them to be very solid and suit MY needs perfectly. Not everyone will agree though, or may need those extra features other boards offer.
And 1 other thing.
One major thing, do NOT skimp on your power supply, or go way overboard on Wattage.
Get a good quality one, as this is the lifes blood of the system.
Corsair, Seasonic, or Antec would be a excellent place to look..
A good 650W will be far more power than needed for a single GPU setup, And a good 750 (like a Seasonic x750 or AX750 form Corsair) will be plenty for 570s in SLI.
Wattages do not tell the whole story here.
For example, for SLI 570s the Seasonic x750 is perfectly fine. But a Diablotech .... best look at around 1200W for those.
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If you'll just run a single GPU, look towards the 650W units. They will serve you well and have plenty of headroom for any single GPU setup, and will handle any OC you can throw at it.