OCZ Flex EX Series 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Triple Channel Kits Desktop Memory Model OCZ3FXE1600C7LV6GK - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227408 $114.99 - $10 MIR

or

CORSAIR XMS3 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model TR3X6G1600C7 G - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145242 $149.99

I would go with the first kit since it's considerably cheaper and has almost identical specs. The Corsair kit just has SLIGHTLY faster timings (7-7-7-24 vs 7-7-7-20 :)).