http://www.anandtech.com/bench/Product/550?vs=647
depending on the games you want to play the 7950 and 660ti look pretty equal, although i'd get this 7950 way before that one
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202006
For the psu i'm split between the antec and the cooler master, the fatality just seems too low on the amperage for the stuff you got (what is it now? 2 480's and whichever gpu?). The antec looks good with a total of 160 amps but it's split over 4 rails, but that should still be fine, just not entirely sure on that
IDK about the ram, it's up to you, you know how much you'll need and all so you shouldn't really need us to tell you that...
Not sure on the cooler, many look good, but overall the arctic stands out to me with the copper tubing which should transfer the heat better, but that doesn't mean it will cooler better or quieter.
For the actual question...
IDK what exactly you'll be doing (well i do some but...) enough to say what you need without seeing the performance myself. IIRC you have the 2600k running at a good high clock on the 212 so i wouldn't spend 80 to go from 4.2ghz to 4.5 or anything, and running at those speeds is overvolting a good bit probably and draining the processors life (if you ain't got it intel actually has overclocker's insurance for like 30 or 35, worth looking into if you want to play with it more). I don't know how full your current hdd is or how soon it will fill up so i can't say anything about the hdd. RAM is the same as i said above, idk what you need, 16 should be fine but 8 shouldn't really hold you back much. Not sure the current psu so can't say and unless you get a 3rd gpu then you shouldn't need more, and you didn't want to get the gpu since it is useless on the current monitor...that money is just no good, you should just give it to me so you don't have to worry about spending it
Really i'd go for the gpu (of course power issues possible...but i'd personally just get rid of the 480's or sli them for gaming and leave it at that instead of folding), then next month get a monitor like that (someone here got one like that, try to find out which if you can). As for which gpu, i'd get the 660ti probably for drivers, the games it does better on are generally bigger titles, and it comes with borderlands 2 (great game and if you don't want it, if you've seen the rol or whatever thread it was, then you know i'll take it
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