I'd say you would be pushing that PSU pretty close to the limit, especially since those AMD cpu's tend to use more power than advertised, id say your better going and getting a better power supply, additionally, its worth getting an i3 as it will give you much better general performance, while using considerably less power. (assuming of course you havn't gotten these parts yet)
ps- also what ajhockey3 said, those prebuilt systems are notorious for using shitey psu's