http://www.newegg.com/Product/Produ...7341012&cm_re=ocz_500w-_-17-341-012-_-Product
something like that will do but only from a reputable brand. this means OCZ, Corsair, Thermaltake, XFX, BFG, and so on.
Brands to avoid: Rosewill, Kingwin, A Power, and anything else that sounds cheap.
That is why I would recommend OCZ memory, or another brand with a similar warranty system to them where they let you go up to 5% over the recomended voltage and have it still in warranty.