What I can say is : Antec are very impressive 250W PSU or 300+W are useless...
Look at my rigs. My SCSI one has 2 7200RPM HDD, 1 10K rpm HDD, 1 CDRW, 1 CD-Rom, 3 case fan, a 7000RPM delta fan, 2 SCSI adapter, a PIII850, etc. And my PSU is still very stable ! Ill try to had another 7200RPM drive real soon and I guess it will works...
In my other computer, I have a no-name mid-range 300W PSU that is capable to run 4 IDE 7200RPM and a 5400 IDE RPM with a GeForce 256 and a PIII700 sloket, 3 case fan, 1 PCI fan...
But actually I would buy an Enermax because of the dual fan setup...but I still think Antec PSU are very strong one...and maybe no-brand PSU are still good enough for most user...
Anyway, I hope it help you.