Originally posted by woot6600GT
Aftermarked VGA fan or heatsink would do you good.
Yeah, agreed. Water cooling your GPU is a waste unless you WC the whole system. With that said, a water cooling rig could be well over your budget. You could end up spending a bit over $150 for a decent system. You could look into a WC kit, but really, why bother with one when you can custom one?
You could go with an aftermarket cooling if you want to OC your CPU. Check out that Zalman
or the Thermalright XP-90
Most stock cooling for GPUs really should do the trick if you aren't overclocking. Unless your getting ridiculously high temperatures for some unexplained reason (I suffer 90C under load on eVGA 6800 GT @ stock), it may do you some good.