Yesterday my PSU CORSAIR Builder Series CX600 600W ATX12V v2.3 took a large delightful dump on me and wanted to know what would be a recommended alternative to that particular PSU. I owned for about 5 months with no problems until now.
I read from multiple peeps that they have had repeat problems with this particular model but if you believe that it isn't all that common of a problem then perhaps I should just have that particular one replaced?
Instead of spending money on a brand new one, if it is already under warranty then no sense in not taking advantage of it. Ask them if it is possible to return and upgrade for a slightly higher model, they might let you pay the difference and then you would have less worries.