OS X :: Mac Pro Video Card Upgrade

So I was given a first gen Mac Pro (2.66 dual dual-core "quad") which has taken a beating cosmetically, but hardware wise it's fine, just bulging caps on the video card: GeForce 7300GT.

This is going to be my testing and OS restore server once I get it up and going, assuming I can do that for less than the cost of a Mini Server.

On GSX the system is listed as "Ver3" so I assume that means it's a later revision that has the PCI-E 2.0 slots.

I need a new video card that will work with this system. Doesn't need to be anything special, I won't be gaming with it. Cheap is always good too. Mac OS X Server's going to cost $500, so if the price goes over $1,000 total, it's probably just cheaper to get a Mini Server. I already need to get an Airport and BT card which is about $150 total.

Apple's TSPS was completely useless at helping with this one, so hoping someone out there will maybe be a bit more helpful. So far I can only really pin down the GeForce 7300GT, GeForce 8800GT, Radeon HD 2600XT and Radeon HD 4870 as being compatible. None of which are very easy to find... At a reasonable price anyway.

So, looking for video cards compatible with Mac OS X, and the first gen Mac Pro. ATI or nVidia makes no difference, preferably sub-$150. I have searched in vain for some kind of list, and wouldn't be posting here if I had any luck, but if someone has better luck with Google than me,