My two cents: do NOT buy a cheap-arse power supply. If you have the cash to buy an x800xt, you can probably spend some money on a good *stable* power supply that will not fry your computer.
Cheap power supplies are cheap for one reason: they're simply not that good. And when you're dealing with a 400 or 500-dollar videocard, "not that good" is not an option.
And what does "not that good" mean? Well, if you're lucky, you'll end up with a reasonably quiet, stable PSU. More likely, you'll end up with a noisy, not-so-stable PSU that'll just be good enough (perhaps with the occasional spontaneous reboot). But if you're unlucky, you'll end up with a PSU that'll fry your components, bursts into flames, or even explodes...
If you must buy a new PSU, I suggest you spend some money on it - expect to pay 60+ dollars for a good-quality 350W PSU. Hell, if you're going to pay that much, a little more money will get you a good-quality 400W or more PSU, which is just a bit more juice for future expansions. Some new Enermax models are able to supply twice the power at 12 volts, which might be a nice idea (seperate power for your x800!).
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