having a quality case will help you mate. i bought a thermaltake xaser V Wingo with side window. it is totally screeless and has 5 case fans, as well as a cap on roof for USBx2,firewire, headphones, mic.

http://www.thermaltake.com/xaserCase/WinGo/v8000a.htm

i have noticed a drop in ym average temperature, though haivng those 5 going and my Jet7 on full creats a lot of noise, just having 5 fans on and configuring them well with speed controls can become barely noticable - anyway after maybe a week i use use to the new fan din as it sounds totally different to my old case.
i have some of my own pics if i find any ill post them.