no. You don't need liquid cooling unless your an overclocker, and that won't keep your system and cooler, it's a crap kit you got there. Ditch sli, for the price of 2 6600 = 300 dollars, get a 7800GT instead, trust me on this. The x-fi platinum is uneeded, just get the xtreme music and save 200 bucks, get a better PSU, the one with the case blows, those siruro speakers suck major dong, ditch them and get better ones, I read a review and they were some of the worst speakers ever.
also get a different motherboard then eVGA, msi or asus.