Can anyone recommend a good 180mm fan? It doesn't seem to be a very popular size. I've found a few by Silverstone, but was wondering if there are any others that people knew of. I think I might put one in the side of my Fractal Arc Midi case to help cool my 8800gt (just put a passive CoolVivaZ1 on it). It's nice to not have the tiny blowdrier fan on it, but it still gets up to 90 C under load. I may just get a 140mm fan since there's better availability/price, but thought I'd check here first. Thanks.