A buddy of mine just picked up a Corsair 600T case that replaced an old Antec Solo. He's been doing some overclocking with his i5 760 on a ASUS P55D Pro and getting ok results, but he's still using the stock CPU fan. He's looking to either replace it with a watercooling unit. Is jumping from the H50 to the H70 worth it? Or should he just grab the A70 instead? Or perhaps something else?