"In my first Sentey power supply review, I have the SDP650-SS 650W power supply here today. The SDP650-SS is an entry level 650W model. For around $80USD, the SDP650-SS gets you a non-modular, 80PLUS certified supply with a quiet 140mm fan and a 5 year warranty!"
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