My Enermax MAXREVO 1350 PSU has been powering my H2O rig since December 2011. In that time it's seen 2x6970s, 2xGTX580s and is now 2xGTX 680s. It remains whisper quiet even as one of my Gentle Typhoons is starting to chirp. Great PSU.
I have purchased several Enermax products over the years. Have a PC at home that my 7 year old is now using that has an Enermax case and PSU and is still running strong after 5 years.