PSU help needed.

Evening all. Need some help with a problem I have. I'll just blurt out as much info as I can so you can give me the best course of action.

Have quite a nice system. 3gh Evesham Micro pc (was top spec when I got it). Needed a gfx card upgrade and delayed upgrading the whole lot to PCI-E(proc, mobo, ram, gfx etc...), as that can wait until late this year/first thing next year, and got a sweet deal on a new AGP 850 pro, flashed and over clocked it to X850XTPE with after market cooling. You know whats coming right....

However now my pc keeps conking off during high usage. First happened after 6 plus hours of BF2. And again after 4. No game crash machine just dies. Looked around (as I don't knwo as much as you guys) and found it can be a common problem when over clocking kit and as a general rule of thumb I need AT LEAST a 350w PSU. One I have currently is 280 which probs explains the crashes after extanded use.

So now I need PSU that fits the bill. Never had to buy one before so I don't really know what I'm looking for. Don't mind paying good money for a new PSU as long as I can take what I buy with me when I upgrade to PCI-E next year. Or even a new case if thats what you think is best. Don't want to spend dead money on kit that I can't take with me.

So ideas would be greatly appreciated and even a few linkys to websites that sell em quite cheap if pos.

Thanks all. Appreciate any help on this one.

thanks for reply. Guide advised 340W but I'll get a 400W to be on the safe side.

Any recommendations by anyone?
And will any PSU I get know be compat when I upgrade next year? Eg you don't need a differnet psu for PCI-E than AGP?

No.

510w Deluxe PC Power & Cooling gets taken down by a cheaper OCZ Powerstream 520w.

PC P&C is over prices.

get an Antec TruePower 430w or 480w,

for modular get antec NeoHE series use the saem fans as the seasonic i believe ultra quiet 80mm fans by ADDA.NeoHE 430w.

My standard recommendation is one of the Seasonic S12 PSU. For you it'll be the S12 430.

Seasonic S12 430 review

Are you saying that you're going to want to upgrade your motherboard soon? If so, you'll want a PSU with a 20+4-Pin main connector as most motherboards made these days have a 24-pin connection. Some PSUs come with only 20-pin connectors (like the one you listed above), others come with 24-pin connectors, and still others come with 20+4-pin connectors which work with either motherboard connection. You'd be able to connect to your current board and your future board with the 20+4-pin type...