Choosing proper AGP card and PSU

Hallo,
I currently have AMD 64 3000+ with 1GB of ram... My old grafic card has passed (was 6600GT) and I need to buy a new one. I currently dont want upgrade whole computer, couse I dont think it is needed yet

Which of these cards will better fit into my pc?
Power Color X1950 PRO (512MB RAM) or Sapphire X1950 GT (256MB RAM)? (HD 2600XP is currently unavailable, so it wont be an option)

And second question is: I currently have 350W PSU, can it handle these cards? And can be cards (or system) somehow damaged if I test it with this PSU (I would like to try if it can power that before buying a new one)

A lot of it depends on the PSU Make/Brand you will want at least 28 Amps on the 12 Volt rail to run the 1950 Pro and the GT is going to be a little less but still i doubt it will run on that PSU.
Without upgrading the PSU you would be ok with a 7600GT as they are very good on power.
It is totally possible that if you put the card in an underpowered system that you COULD blow the whole system or the card may just throttle down to run on available power or just not work at all. Either way its a Very bad idea to just suck it and see, putting a card in a system you are fairly sure is underpowered is just a recipe for disaster.
Best bet would be to get a good 450/500 Watt PSU with a 28+ Amp rating on the 12 Volt rail Antec are good in my experiance and then get the 1950 Pro to go with it.
If you want to check your amps its written on the side of the PSU (just in case you wasnt sure).
Mactronix

HD 2600 XT ~ 130$
X 1950 GT ~ 160$
X 1950 PRO ~ 190$

problem of 2600XT is that it is sold out everywhere here
Best price / performace looks to be GT, but Im not sure if it is better to pay little more to push system a little bit higher... Also PRO seems to have better cooler (GT is sapphire PRO is Power Color)

Yeah get the x1950pro then.

What's the total watts for the 12+ rails? Should be somewhere on your PSU sticker.

Im fairly sure that its a single rail 16A psu so wont be enough to run those cards which means getting a new oneif you want to run one of the 1950 cards.
Mactronix

That one would do . It has a combined total of 29amps on the 12volt rails.

You should be alright with that @ 29amps
+12V1&+12V2 total output shall not exceed 348 Watts.
348w divided by 12 = 29a

get ready for call of duty 4 on max settings like i do lol