That information will help me to build a picture of how hot your case runs now. I suspect you havent changed anything in the case as yet? As SD90 stated, for the quickest cheap mod, an exhaust fan could shave a degree or two off your internal ambient temperature. I suppose the cheapest mod available to anyone is running it barebones (no case panels, frame only) as all you need to buy then is a can of compressed air to blow the dust out occasionally. Sounds daft I know, but then as long as the room is cool the PC is cool.