That particular supply is definitely better than the Rosewill but the Corsair would be a much better supply in the long run. It's got a decent amount of voltage fluctuation (a bad thing) according to this review.
Motherboard: Gigabyte GA-EP45-UD3R - Link
Processor: Intel Core 2 E8400 3.0GHz - Link
System Memory: G.Skill F2-6400CL5D-4GBPQ - Link
Video Card: EVGA GTX 260 Core 216 896MB - Link / Review
Hard Drive: Samsung HD502lJ 500GB - Link
DVD Drive: LG GH20NS15 - Link
CPU Cooler: Xigmatek HDT-S1283 -...