Thanks for all the replies.
The Antec Neo Power is comparable to these PSU's, but it costs $50 more.
The Coolermaster RS450 is
noisy and it's not available in local stores ($120 online).
The other PSU's are all stable and offer similar features like ATX Ver. 2, low noise, pci-e and s-ata connectors.
Here's what sets them apart:
OCZ Modstream 450 W $99
Distinguishing Feature
Detachable Cables
Con
Active PFC only on Int. version
Enermax Noisetaker EG495P-VE 485 W $99 (changed)
Distinguishing Feature
Smart Fan (stays on for 2 min. after shutdown)
Fan Speed Control Knob
Con
Passive PFC
Thermaltake Silent PP Butterfly 480 W $105
Distinguishing Feature
Active PFC
Fan Speed Front Control Panel
Extra Case Fan (noisy, low CFM)
Con
Bad Name?
Seasonic S12 430 W $124
Distinguishing Feature
Active PFC
Quietest
Con
No PCI-e connector
The Thermaltake PSU seems to be the most impressive, with the Enermax and OCZ tied for 2nd and the Seasonic coming in 3rd because it doesn't have a PCI-E connector and the price. I wouldn't use the case fan included with the Thermaltake PSU, because the Antec 3000 B case includes a better case fan.
80x80x70mm Blower case fan
10.7 ~ 25.0CFM
21.0~41 dBA
120mm Antec 3000 B Case Fan
CFM: 39 / 56 / 79
dB(A): 25 / 28 / 30
I've found many positive reviews for the Thermaltake PSU. Did Thermaltake make bad PSU's in the past? Can anyone find a bad review of this PSU?
I would consider the Seasonic if it had a PCI-E connector. How important is it to have a separate PCI-E connector? I don't think an X800 XL needs a PCI-E connector, but I might need one when I upgrade my video card in the future.
Choosing a PSU is definitely tougher than choosing a CPU.
My system:
$258.75 Athlon 64 3200+ 90 nm. Socket 939 RETAIL BOX (2.0 ghz. 10x multiplier)
$187.45 OCZ PC3200 DDR400 512MBx2 CAS 2.5-3-3-7 (OCZ4001024PDC-K)
$217.35 DFI LANPARTY UT nF4 Ultra-D (nForce4 Ultra)
$458.85 ATI X800 XL or $50 more for the Gigabyte X800 XL (heatpipe)
$113.85 Enermax or OCZ or Thermaltake or Seasonic
$ 80.49 Antec SLK3000B
$1,316.74 CAD