The Cooler Master N200 Case has amazing potential and major bang for the buck. It comes with two 120mm fans and more can be installed, fan filters, ample drive bays, fits mATX & mITX motherboards, water cooling friendly, USB3, is lightweight, looks great and affordable.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips