Wanted to add one more thing. There are PCI slot fan sloutions that Actually will blow air OUT of the case that comes directly off the vid cards fan flow. So, the vid card fan blows the hot air down, the pci fan slot thing catches that air and immedietely dispels it out at the back bottom of the case. This CAN help, especially since the hot air coming off the vid card doesnt get circulated in the rest of the case and then finally dispelled out the back TOP. These pci slot fans arent too expensive either, I think like 19.99 or something and I have seem them work.
This link shows one example and its only 7.95. Cant beat that! And if it doesnt help too much, then you havent wasted much of anything