Generally speaking, since I don't know if you plan on OC'ing or not, but you should be fine with a Antec 380w Earthwatts PSU. You wouldn't have really any upgrade room with that PSU, but it would work at stock speeds. I'd recommend at least a Corsair vx450w PSU that has 33A on the 12V rail, so you'd have plenty of power for upgrades. Here are a few options to consider:
$60 shipped and has 30A on the 12V rail. Has 3 yr. warrranty and is power efficient.
Antec earthwatts EA430 ATX12V v2.0 430W Power Supply 100 - 240 V UL, CUL, FCC, TUV, CE, CB, C-tick, CCC - Retail
http://www.buy.com/prod/antec-earthwatt-430w-80-plus-certified-power-supply/q/loc/101/203477215.html
$80 - $30 MIR = $50!!! One of the better PSU's to get for this price. Has 41A on the 12V rail, 3 yr. warranty, and is power efficient!
Antec earthwatts EA500 ATX12V v2.0 500W Power Supply 100 - 240 V UL, CUL, FCC, TUV, CE, CB, C-tick, CCC - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371007
$75.50 - $15 MIR = $60.50!! Nice PSU for this price. Has 33A on the 12V rail, 5 yr. warranty, and is power efficient!
CORSAIR CMPSU-450VX 450W Active Power Supply Retail ***Free Shipping***
http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=10006428&prodlist=celebros
$88.90 - $10 MIR = $78.90!! Hard to pass up on this 41A on the 12V rail PSU. Has 5 yr. warranty and is power efficient!
CORSAIR CMPSU-550VX 550W Active Power Supply Retail ***Free Shipping***
http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=10006757&prodlist=celebros
All of the PSU's above will allow you to OC, with room to spare. You can decide which one suits you the best, but anyone of them will work.
Edit: Forgot to mention that this PSU/Case combo is quite nice for the $. It has the Antec 500w Earthwatts PSU, as mentioned above.
$110 shipped!
Antec Sonata III Super Mini-Tower w/ Earthwatts 500w Power Supply - SONATA III
http://www.buy.com/prod/antec-sonata-iii-super-mini-tower-w-earthwatts-500w-power-supply/q/loc/101/204559259.html