with a 6600GT you can run it at 1024x768 with 4xAA and the preset High, which is the highest of all the presets. Although you can bump up the Image quality more, I haven't checked it out to see if it's worth it. The higher texture setting didn't seem to do much of anything. Anyway, utilizing these settings, you will get acceptable framerates. There will be some frameblur which looks like framerates are hanging around the 30's and maybe a bit lower and places where it gets unacceptable sometimes, but only for a split second where it might drop to 24fps. I had Vsync on too, so if you don't mind turning it off, it might help towards those issues.
128MB of VRAM seems to be fine for it, but if you want higher image quality using AA and AF and higher resolutions such as above 1024x768, then the RAM will certainly come in handy. But I doubt, you'll get a card like that for 200.
That 9800 pro 256MB is nice, but there is too much memory, you could get a faster card for the same price.
If you open the computer up, the powersupply should have a sticker on the side, or somewhere on it.
I agree with Pete on this.
128MB of VRAM seems to be fine for it, but if you want higher image quality using AA and AF and higher resolutions such as above 1024x768, then the RAM will certainly come in handy. But I doubt, you'll get a card like that for 200.
That 9800 pro 256MB is nice, but there is too much memory, you could get a faster card for the same price.
If you open the computer up, the powersupply should have a sticker on the side, or somewhere on it.
I agree with Pete on this.
If you do buy a 9800 Pro, don't spend more than $130 on it! That extra memory is not that helpful! Trust us! If you want to see that memory put to use, you need to go high end, at least X800 or better. The way it is, you won't need that texture memory as the 9800Pro won't be able to draw them fast enough for good performance. 
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