With the Platinum 1000 Watt Seasonic presets an aboslute high-end power supply, which scores with an excellent delivery as well as a very high efficiency. Furhtermore Seasonic only uses high end components for this product and therefore this thing should be rock solid for years.
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