The DX9 Cards will weed a lot of people out.
Note that they say "compatible".
IIRC, a TNT is DX9 compatible. But you're going to be missing out on a lot.
They state that it must be VS and PS compatible though, which weeds out everything earlier than an original GeForce (if I remember my features correctly). The 64MB req. weeds out everything prior to the later models of GF2.
You certainly don't need a ATI 9500 or better, or nVidia FX or better card.
And that's my sum total interest in this, except as something to read while waiting for compiles.