Don't use adapters. Just don't. This is currently the cheap one to get. http://www.newegg.com/Product/Product.aspx?Item=N82E16817139026
Corsair CX430 v2. $47 out the door, $37 after rebate.
Keep an eye on this one as well as they change prices.http://www.newegg.com/Product/Product.aspx?Item=N82E16817371033
Antec 380W green. $50 out the door.
Save yourself the headaches of adapters and sub standard PSUs. Get a good one. The Antec is slightly better then the Corsair, but not worth the extra $$$. (as long as you get the rebate that is...)