Rosewill is rebranded products...and for the most part, they're just not as good as the "name brands."
You don't NEED 1000 watts...you don't give the rest of the specs for the computer, but for a "normal" computer with a single video card, one or two optical drives and a few hard drives, you'll be just fine with a power supply in the 500-600 watt range.
I highly recommend the following brands:
(in no certain order)
Corsair
XFX
Seasonic
Antec.
Stay away from the low-priced "junk" brands. The power supply is the "heart" of your system. DO NOT cheap-out on that...