I am a lucky owner of an 800w Epsilon PSU then. Since the Geforce 8800GTX and I used those in SLI with a Q600 for more than one year. My PSU is still there.
Not saying at all that problems never occur of course, but it seemed to me that a positive feedback about those PSU's was welcome here, supplying a 5870 and an I7 950 @ 3200Mhz with 4Ghz UCLK, 3 HDD and 6Gigs of memory. Also lots of fan for my water cooling.