Why don't you build a "nostalgia rig" to play your old games? That way you get the most out of your old parts. I think I used up my old Radeon because every time there something fancier than the desktop, the rig reboots...

I think I have a old voodoo card around somewhere... I should try that one... Thought I am planning to upgrade the GPU on this here uber rig, so I might switch the GPU from this to the nostalgia rig and see how that works...
My point being; there should be an abundance of old parts everywhere. Saves one a helluva lot of tinkering when one can play old games with machines they were coded for...