I'd look into Enermax 535w or OCZ 520w powerstream. Both are very solid performancers and never a hiccup to my experience. For price-performance balance I'd try the Enermax because it's $80ish at places like Newegg and Monarch. For pure performance buy the OCZ (but it's around $130 or so). Other brands like Antec, Seasonic, Tagan, PC Power & Cooling are also reputable brands.