If you are on a budget the Sparkle 300 watt unit ($33 shipped from newegg) should be more than enough. Nothing wrong with the Antec units (or enermax either, for that matter) other than their cost. I have a Sparkle 350 watt and it has been more than adequate for my XP1700+, KT3 Ultra2, 512 MB PC2100, 2 hard drives, CDRW, CDROM, and Geforce 3 Ti200. Am stepping up to an Enlight 420 Watt unit for the XP2000+, KT3 Ultra2, 512 MB PC2100, 2 7200 rpm hard drives, CDRW, DVD, and 128 mb Geforce 4 Ti 4200. New power supply should be here monday, new GF4 vid card by Friday. I can see where a 250 watt might be touch and go with your specs.