ok well first IMO check this case out. I use it for my setup and it is ALLWAYS blowing out cool air its really nice.
EDIT: it wont let me post a link.. I have to post a few more times thought.. hmm lets cheat the system sry moderators its only a Newegg link so no harm here.
new
egg.com/Produ
ct/Product.as
px?Item=N82E16
811108376
(you gotta fill in the W's n junk it keeps picking it up as a URL for me
Second if your running 50-60c allways then randomly peaking to 80-90 do the following. Dismantle your heat sink down to litterly jsut it take the entire thing appart and clear ALL the dust out. From the sound of it your tower isnt utilizing all its fans so its intended flow of air is being disrupted and most likely circulation isnt enterierly there. After that you NEED to replace the thermal paste between the heatsink and ur chip. Do both of these first and that should fix it on its own. Also I suggest rethinking how everything is arranged inside of your tower. To not use one of your fans thats built in is kinda silly as they are designed in a way that its most efficient to use all of them at once. And if not designed like that, then you baught a crummy case that most likely just looks fancy. Best of luck