But that 3700+ costs quite a bit more than the slower optys, while the optys are made to last cuz they're supposed to survive in server situations.
These are the steps in CPU/GPU cooling:
Air cooling
Water cooling
thermoelectric, aka peltier
chilled watercooling
phase change
dry ice, or DICE
liquid nitrogen, or LN2
While it does give lower temperatures than watercooling, it takes a lot of power to run peltier cooling AFAIK. If you're willing to spend 400 on cooling, wait for OCZ' phase change system, it'll cost about 300 - 350 and give sub-zero temps.