Do I need more PSU power?

[Supernoob]

My current PSU is showing it's age and I've been looking to upgrade my video card to an x1950 pro/x1950xt (AGP) and maybe add a second HDD to my current rig.

My current set-up:
Gigabyte K8NS pro mobo
A64 3200+ cpu @2.2ghz
1 gig Kingmax ram (2x512)
ATI 256 mb X800XL
Lite-on DVD-Rom
120 GB Seagate barracuda HDD
PSU 500 watt Usicase (18A on +12volt rail) 8O

Will either of these PSU's cut the mustard (so to speak). Antec Truepower 2.0 480watt or Silverstone EF Plus 500watt.

Any thoughts or suggestions?
Cheers all.

 

[dragonsprayer]

if after 20-30 mins your system crashed most likely the psu is too small.

as far as video cards skip the 1950xt if you plan on vista - no driver support.

we run the x1950 pro and the x1950xtx crossfire (2 cards) both work good. both my cards are open box from new egg $300 for ati x1950xtx and crossfire - if they fail i send back to ati. no problems!

 

[Supernoob]

Both PSUs have more then enough power for your system. This one would be a more afordable option.

http://www.newegg.com/Product/Product.asp?Item=N82E16817104954

All you really need is about 26A on the combined +12v rails for you system with the praposed upgrade. This PSU offers a total of 29A on the +12v rails.

Sorry, I can't use newegg as I live in Australia (curse it all). Would an Antec Truepower2 430 watt PSU be enough? Just want to check as I can get one for about $80 australian. TG's Psu reference list (AUS) says it has 31A on the Dual +12v rails.

Cheers for the help mate!