I'm having a look of all that but it would be better that someone who already use an ATX PSU with no +5V problem confirm a PSU brand for us all.
I've bought two from CPC (300W unbranded) and never had any problems with them powering my main set up...
Blizzard060/PPC 60Mhz/240Mhz 256MB RAM, 2 x 500GB HDs, 2 x DVD/CD Re-Writers, FastATA MKIII, SubWay USB, Cocolino Wirless Mouse Adapter, Custom Built 8W Audio Amp and it's still got plenty left to power things like the Vidi 24RT, Card Readers, Midi boards, Audio Digitisers, Rendale Genlock...

Never had a problem with lack of power yet (or the PSU failing)...
