I've owned both a 300 watt Sparkle and a 431 watt Enermax. The Enermax is a nice PSU with lots of connectors, an adjustable speed fan, etc., however I've found that when not modded it is liable to have low -5 volt rail issues. The Sparkle, on the other hand, was a decent amount less expensive and performed like a champ, even powering dual athlons, a GeForce, and a load of peripherals. Both are decent PSU's, however my vote leans toward the Sparkle.