I'm on my second Albatron card right now - sold my old Ti4200 last December, and purchased an FX5900. Runs 500 core/975 memory all day, up from the default 400/850 defaults. This is after a successful FX5950 Ultra flash, of course.
Using a finance currency converter, 177 Canadian turns out to be $134 US dollars. The only question here is WHY HAVEN'T YOU BOUGHT IT YET? That's an amazing deal, even if it was for the lowest bottom-of-the-bin FX5900XT available anywhere. Just to be sure, this is the model with 256MB of memory at 850 MHz and a 410MHz core clock, correct?
http://www.albatron.com.tw/english/it/vga/specification.asp?pro_id=69
$134 for that card is an absolutely amazing deal; a comparable card would still cost well over $200USD...
For overclocking, I'd look to hit at a very miminum 470 on the core and 950 on the memory. Performance would be comparable at that speed to an FX5950 Ultra; it's worth trying the 5950 Ultra flash...
Warcraft 3 is going to be an absolute cakewalk for a card like this; the rest of your system will count more for games like that anyway, but rest assured it will do it just fine.
Doom 3 will definitely be fine for the FX5900 cards; it's an OpenGL game, and nvidia's OpenGL support is top-notch. If it will struggle with a game, it'll be DirectX-based games like Half-Life 2... the FX series cards had lackluster DX9 support, at best. But at least you have brute memory bandwidth and fill rate to counter that a little bit. I'd look at 1024x768 probably being the playable res for HL2 on that card... but alas, we'll only know for sure once it's released. With many of the driver revisions, I've found the FX5900 image quality to be perfectly acceptable, despite what the fanboys were saying a few months back.
Anisotropic filtering hits the FX cards really bad - thier algorithm for AF isn't efficient at all. You can expect a huge performance hit when you go from the 4x to the 8x setting, and many games become pretty well unplayable. 4x is definitely where to set it for most games, or 2x if you like high frames better. It's not quite as good-looking as the ATi AF, either.
But the anti-aliasing is pretty well sorted out. Since it's mostly dependent on memory bandwidth, anyway, the FX5900s are well-suited to it, due to the crazy memory bandwidth. For my purposes, 2xAA is pretty well free, and 4xAA takes a significant performance hit only after you get up to 1600x1200 resolutions.
