Is there ever a chance you build a PC in the future? If so, it makes sense to step up a little bit and purchase a power supply that could be carried over to a new PC, something like an XFX 550W for $55 or so. If not, the CX 430 ought to work just fine.
I don't like to recommend refurbished PSUs. When you buy a refurbished PSU, more often than not, it was just tested to see if it's working and there's a lot more to a PSU than that - it's like buying a used tire.