An AGP NVidia card more modern than the 7000 series. Needs to have good H.264 acceleration, and of course more gaming performance. Doesn't necessarily need to be the ultimate powerhouse - something like an AGP GT240 would be cool.
Late 3Dfx cards. Obviously there's a lot of demand for them compared to their current population. Make them bulletproof, and if anything is changed in terms of features, then focus on maximizing their backward compatibility to earlier Glide games.
An "ultimate" legacy ISA Sound Blaster AWE32 with low noise, genuine OPL3, no hanging notes bug, simple jumper based configuration without PnP, and quality capacitors.