A BIG case always does help. Try this one:
http://www.performance-pcs.com/catal...oducts_id=3529
or this one
http://www.performance-pcs.com/catal...oducts_id=3219
or this one
http://www.performance-pcs.com/catal...oducts_id=1858
They are all beautiful, huge, and rather pricey. I recomend shoping performance-pcs.com BTW. They have great service and, this is especially good for you, they are located in Florida. I live in Orlando and frequently order stuff from them. It takes 1-2 days via standard ground.
I'm unclear about a few things. Do you just want to keep your system cool, stable, and quiet or do you want extreme performance? If it is the former, you are barking up the wrong tree. I'll carry this post on in a minute....