Why do you feel you need more power out of your power supply? Have you checked your power supply's website?
well i feal I might need a lil bit more power out of it becuase i got a new graphics card today, and it says a minumum of 450watts, that is the only reason why. I got the 7900gt card by EVga if that helps any. no i havent check my psu website but i will right now and what i can come up with.
Before spending your money run your system with your new video card for a week or two. If any issues begin to crop up you MIGHT need a power supply, but I'd check your card as well. Two things: great card and that Antec should more than supply what you need. Edit: I looked up the specs on your power supply. I was right, save your money. It more than gives you what you need.
Zeyf414 thanx for the reply and thanx for al ur help both ppl that helped me out. Zeyf414 you were a big help thanx again. take it easy