Don't go with watercooling! It will add another $400 onto the price if they give you a good kit, and the ready made kits are actually worse than the stock AMD heatsink! You void the AMD warranty instantly, so you're relying on the manufacturers warranty alone then. You'll have to drain it every 3 or 4 months for it to carry on being effective, and you won't be able to move your PC very far without draining and refilling the whole system. You would also have to learn all about water cooling, and what to do when you get leaks, air bubbles, and stuff like that.
Trust me, it'll be worth it!