New computer

You should get the "IVY Bridge" CPU im pretty sure it launched yesterday. You get a 10%-30% CPU performance increase and its about the same price as the i7 2600k, its more power efficient, and generates less heat. Get the Core i7 3770K instead of the i7 2600k your getting an Ivy Bridge Mobo anyway so...

First of all, build it yourself. Secondly, consider what Azn said. I'm not really up to date with price trends right now since I'm prepping for my finals and stuff, but with the new gen of CPUs out and X79 proving quite lucrative in the higher-end department, you might want to consider a mid-range X79 board coupled with the newly released mainstream 3770K.

Furthermore ditch the dual HDDs in favour of an SSD + HDD combo (trust me, you don't really need more than 500GB / 1TB of storage and that SSD really makes a difference when it comes to performance - also make sure you stick your OS on it and not the HDD). RAM's okay, but I would personally rather go for 2x4GB or 4x4GB of budget RAM if it leaves more money for a better gfx card. And while we're at gfx cards ... drop the 580, it's worthless. Dunno why you even want a second 520, which is even more worthless, best bang for the buck in the über-high-end would come with the 680, or, if you want to save a bit, fall back down to the likes of the 7870 or even the 560 Ti.

Oh and you'll never draw 1kW from such a build, ergo get a cheaper PSU.

The GT 520 will bottleneck you GPU. What the hell is that even supposed to be for? The performance you will be get will be like 2 x GT520s. The RAM; dual channel? Maybe you can opt for quad channel or I think it should do quad channel itself.. CPU; wait. Once they get IB then you can select one, the i7-3770K should be the equivalent for that. Should be same price, around 15% faster, and more power efficient. Drop down to a 850-watt-ish PSU with good power efficiency. This was just my two cents.

---------- Post added at 07:45 AM ---------- Previous post was at 07:42 AM ----------

PS. The hell! There is a GTX 680 available for 22 bucks less, and much more power efficient and you go with the GTX 580? No hurt intended, but it is a good thing that you got your build checked here.

The "quad channel" kits will just be four sticks of the same ram as you'll see in "dual channel" kits. That being said, spot on, though the 520 doesn't have to bottleneck anything, he could potentially just use a setup where he falls back to the 520 from the 580 to save power. Though if that's his intention, the 7000 series from AMD has amazingly low power draw when idle, I think some of their cards promoted something as low as 2-5W

2-5W? I guess that my PSU for those might just be lemons :P. Yeah, that's pretty much what I thought about quad channel, just some were 'locked' by the manufacturer to still operate in dual channel mode. Why even spend money on a 520 if you won't be gaming on it? Can't he use the same setup using the IGP?

---------- Post added at 01:45 PM ---------- Previous post was at 01:44 PM ----------

PS. Again! I could imagine that setup being worthwhile if you had a primary Radeon card, the 520 would be a pretty good PhysX card

IDK about the mobo. Some Z68 mobos are software locked to not take IB.. Let the Ivy Bridge options come out, then we will see?