Eh, pretty low wattage without knowing the specifics of the PSU itself (make/model etc to research the build quality).
Really you're going to be hard pressed to build anything in entirety for under 600 bucks that would warrant spending the money. The best thing to do would be to save up for another paycheck, another month, however long, and up your budget to about 1000 dollars. At that price point you can start implementing worthwhile components that will last you for a while, as opposed to flushing 600 dollars on something that is outdated as you build it.
That's my best advice, although perhaps not what you wished to hear.