The best 3d card to run with NT 4.0 right now is the Voodoo3 series.
That said, you will not be able to run AH with NT 4.0 with any 3d card. Direct3d was never really implimented in anything but a bastard software version for NT 4.0. DirectX 7.x was never transported to NT 4.0 either.
Your best bet for running AH is to get Win2000. It is one of the least painful OS installs I have ever done. Installed the CD (into my NT 4.0 system) and clicked OK... came back an hour later (was watching TV) and the new OS was completely installed.
Right now, AH has some interface bugs with Win2k. However, Win2k does have DirectX 7 and hardware accelerated Direct3d support (depending on drivers of course... but at least its possible).
AKDejaVu