I've purchased a Dell XPS 630 system with a 19'' monitor, 8800 GT card, 3 gig of ram, 2 sata HD's, and also a basic HP color deskjet printer. The pc has a 750 watt psu. I was wondering first of all, if I should get a Backup UPS or just a nice surge protector. Secondly, if I should get a UPS how much of one do I need? How ...