If you plan on keeping the computer for some time then get yourself a good power supply. For a 450-500watt PSU you should spend no less than $50. Also, the better PSUs will be heavier than the cheap ones. If you're using an ATI HD3200 video card then you'll definitely need a PSU with a 6-pin video card power connector. You can also buy adapters too.
I don't know where in the Razorback state you reside, if you've ordered from Newegg before they have great prices on most computer parts.
It would be best to get one that is 80 Plus Certified. Those certifications come as Standard 80 Plus, Bronze, Silver and Gold. For your purposes the Standard or Bronze will suffice.
This one from Newegg is an ideal choice for you. $59.99 with $20 mail-in rebate which then makes it
$39.99, Free shipping and 80 Plus Certified, also it's an OCZ brand which are very good PSUs. In addition, it's modular so you only use the power cables that are needed which reduces clutter in the case.
This is one HELL OF A GOOD BUY!
OCZ ModXStream Pro OCZ500MXSP 500W ATX12V V2.2 / EPS12V SLI Certified CrossFire Ready 80 PLUS Certified Modular Active PFC Power Supply compatible with core i7