get the 8400GS, looking here
all the ati low end cards crash running bioshock maxed out at just 1024x768 while the 8400GS gets a VERY respectable 12.4 FPS, unplayable yes but thats with it completely maxed out, your 8500GT only gets 3 frames more! this is with a much more high end cpu but it will be able to play a lot of games with medium settings and old games maxed out. video playback should really com alive too, better than my 8800GTS sad to say, but thats just cause it has a newer core
kind of off topic but at a shop i know there is round IDE cables, i wanted to buy one, i had 5$ on be, should be enough for one right. guess how much one was...20$!!!! ridiculous, im 99% sure these people get there stuff from like newegg lol, they should be buying directly from the manufacturer but its a very small store, some pretty good deals though on stuff thats really cheap, but expensive to ship.