I have several 80mm case fans and a 120mm blowing out the back. The problem is the case is so small that the front fans blow the heat from my hard drives right on to the video card.
My cpu is fine because it's running on a Prometeia. I've done TEC before so I know all about it. If I put a TEC on the video card, it wouldn't matter if it adds extra heat into the case since it wouldn't affect the CPU or GPU and there's not much else in there.
An 80W TEC is plenty. The MCW50-T is an 80W TEC being water cooled. It was super cool, enough that I did get condensation and had to seal it up better, heh. Anyway, I don't mind the extra insulation, I'd still be running water/TEC if I didn't mind the extra large case. I'm just looking for an easier way to run the TEC for some decent temps now with the smaller case.