I finally sprung for a nice cooler, the Zalman NC2000. I tried two cheapies and one was actually really nice but the Zalman made a noticeable difference when gaming. It's certainly not cheap though.
Here's an overview: http://www.youtube.com/watch?v=RU1Y-7xPjqQ
I was wondering what is your GPU temp. while gaming using the Zalman cooler? Mines get up to 100 C.