R7 260x work with my psu?

Depends on if you have a 6 pin PCI to connect to the GPU. Probably do not with that small of a PSU. Get at least a 460 and you'll be fine. EVGA, CoolerMaster, Corsair, they all make decent PSU's. And they're not that expensive.
 
Thank you guys I just ordered the one Blackbird suggested through Amazon will be here tomorrow :) this is my first time doing hardware related stuff with my computer, so tomorrow I'll be installing both my new graphics card and PSU :)