sp74SupraSorry guys, did some research and looks like there isn't a big difference, i'll go with the aluminum and spend some more money on fans. Thanks
2ez2KiLLYoull be able to find some good fans on ebay. A lot of people that sell fans rip you off in shipping though (12.95 shipping for 4 fans) Once in a while youll get a good deal (ex. 4 uv led fans for 6 bucks + 5 bucks shipping)