You stated you are experiencing high temperatures. Please post your ambient room temperature, cpu core temperatures, and which utilities you were running when the temperature readings were taken.
Please post the brand and model of your current case and a list of your components, including the brand and model of the cpu heatsink. Without that information it is pretty much impossible to make a valid recommendation.
^ good point. My room temp is about 20-22 degrees hot all the time 24/7/52. And according to speedfan i got a core temp of 48-52 degrees non load and about 60 during stress test. I use a AMD phenom x3 720 BE OC'd to 3.1ghz. Temp 2 (think it is GPU or something) is what i'm worried about. I got this 2gb sized Radeon 4890 Sapphire Vapor-X GPU, and speedfan is reading temps 62 degrees during no load and about 65-67 during a normal game like Bioshock 2 and such.
The case i got today is an old Coolermaster wich i unfortunately dont know the name of. It's a mid tower black with 1 exhaust fan in the rear and one inblow on the side door.