I'd still suggest changing the PSU to a corsair one. Your XtremeGear is apparently a very low quality generic PSU which won't last as long, and won't provide the 700W that it states. People have reported that they only last about a year before you have to replace them and when they do go they may take other components with it.
Where as a well-known brand which costs more there are fail-safes which will prevent damage to your components in the less-likely event of it going kaput. Better quality PSU's will also produce their advertised wattage so you know what they are capable off. Corsair is a well known brand which produce quality products, Coolermaster produce cheaper PSU's than Corsair and have head mixed reviews on if they are safe to use in a high value machine.
What I'm trying to get at is if you get a cheap PSU there is a chance that it could die and damage your other components so I'd change it for a better PSU
Just read up somewhere and it said the 700W XtremeGear actually produces more around 450W so it is a bit misleading