I´ll help by suggesting some games from that era 97-99 (that your system will be able to handle properly):
(will avoid mentioning the titles others here have already and also FPS, since you clearly stated it)
- Incubation, Time is Running Out
- Heroes of Might and Magic III (arguably that franchise best ever)
- Command and Conquer Tiberium Sun
- Dune 2000
- Baldur´s Gate
- Diablo & Diablo 2
- Motorhead
- Collin McRae Rally (1)
- MotoRacer
- POD , Planet of Death
If you can´t find a MX440 as some have suggested, for these titles above a TNT2, an Ati Rage128Pro, Matrox G400 or s3 Savage4 will do just fine. Voodoo Banshee are not that expensive (yet).
256MB RAM I believe it is the maximum admitted by your chipset, which is also optimal por W98se.