I have a four year old MDD dual 867 with the lowest rung video card (at the time). Now I want to upgrade it just a smidge to the ATI Radeon 9000 Pro (as you can see in in another thread, I only want this computer to last me another six months to a year before I give it to my parents). How much do these cards usually go for? I've found these two (here and here) on eBay, and I was expecting something around $50. Am I thinking way too low? I mean, these weren't even truly top of the line four years ago, and they're still going for ~$75 used? Maybe I'm just not understanding.