I was beaten to the punch, so I'll just re-iterate: never, ever buy something as important to the well-being of your PC like a PSU for a penny on the dime.
Usual consensus is the following:
- If it's too cheap, it's usually cheap for a reason - it's horrible.
- If no one has ever heard of it before, don't risk it.
- Never buy a PSU on the stated wattage alone. Why? One, you don't from where that total wattage was measured. Two, you should base a PSU purchase on how much amperage is available on the single or multiple 12V rails and then it's total wattage.
- When putting together a system you usually want to spend a bit more on your PSU if you can. There's no such thing as having a PSU with "too much power" despite what anyone tells you. Additional, or even excessive headroom is always a good thing, it allows for expansion down the line without any compromise.