Originally Posted by Wherewolf?
Yeah, The Coolermaster cooler is a good choise. Then you will have some overclocking headroom too if you want to do that later on?
You wont get that much lower temperatures if you put it on the floor. You likely will get more dust collection instead.
What you could do, is to snip away that mesh in front of the exhaust fan. That mesh, makes the hot air from the fan bounce back and forth, and not much of it will actually get out of the case right away. This will also make the hot air build up inside the case. Just securily tape up a bag of some kind around the the case, fan hole before you snip. You don't want to get any metal shards into the case.
You will also get a more quiet case fan by removing the mesh.
I'm not sure about the OP, but I could imagine some people being nervous about making a modification like that. I know myself and I'd probably avoid cutting the mesh myself out of fear that something could / would go wrong as a result of doing it.
If you're like me, start with a cooler and you'll see a pretty decent drop in temperature over stock. For your purposes, that'll probably be enough for you to feel comfortable with the unit's temperatures.