Hello,which company manufactors the best 5770 cards . im looking to buy one. i like the msi 5770 hawk with twin turbo cooler (looks nice). but ive read reviews that say it doesnt come with memory cooler, so could someone tell me how does not having a memory cooler affect the card in anyway? also i like the XFX brand but not sure about the 'lifetime'warranty. http://www.newegg.com/Product/Product.aspx?Item=N82E16814127490