Just make sure it's a quality psu or you may end up having to build another system.
My PSU is a Cooler Master B700 - 700w
Mediocre PSU at best, while there are much worse available, there are usually higher quality units around the same price. It will probably work but I wouldn't trust it as a long term solution. The only Cooler Master PSU I would even consider buying is the V series as they are made by Seasonic.