Just look into reviews, you don't want to cheap out too much on one 
I've considered upgrading mine now that I've started mining.
I've considered upgrading mine now that I've started mining.Good call. I am reading around. Looks like this is a good bet. APC's Back-UPS ES 750VA
http://www.crn.com/news/channel-programs/199702310/how-to-build-a-high-end-gaming-pc.htm;jsessionid=0lNX+GONAapJg15FWJ164g**.ecappj01