if you go to
www.silentpcreview.com you will find the Antec 550 is louder than the OCZ 520w but is still on there recommended list
I think both are a good choice..I went with the OCZ 520w....5 yr warranty...I liked all the connectors
2 single special shielded 4pin for VGA/HDD
1 PCI-E
2 SATA
2 with 3 4pin molex and floppy
works with P4/P8
20pin/24pin
leads are braided or shielded
For what its worth it has a very nice mirror finish too
It is quiet..also I liked the idea of the front/rear fan vs bottom and rear like my old Antec TruePower 480w
Also I like the idea of the adjustable POTS...not sure whether this is really important or not
I have been using the OCZ 520w for about 10days now and I anm very happy with it
Also my rails never seem to change
P4 2.4@2.9 at 160fsb with 1.625v
Abit IT7 MAx2 rev2
1gb pc2700@pc3200 at 2.7v 4:5 divider
Radeon 9700pro
2x160gb Maxtor HDD
dvdrom
dvdrw
cdrw
Audigy2
Adaptec 2906 scsi card for my scanner
2 80mmx25mm Mad Dog whisper fans..27cfm@22db