You should be good to go with a modern(ish) PSU on such a system.
Try to get one with at least 25A on the 5v rail if you can.
It's mainly the Athlon XP systems of that era that are very hungry for 5v.
Don't worry too much about the -5v as it's mostly, only needed for a few old ISA soundcards and suchlike.
I use Corsair TX-650 PSU's on my rigs, with a 30A 5v rail.

Good luck and have fun!

Anyone know if the Sound Blaster 32 CT3600 ISA soundcard needs -5V? It’s similar to the awe32 and awe64 so I’d bet it is the same as those, so if you don’t know about the ct3600, anyone know if the awe32 or awe64 need -5V? If yes for any of these, any idea on the amperage on the -5V needed? If it’s low enough I could build a smaller inverter.

amalgim wrote on 2020-11-20, 14:10:

Anyone know if the Sound Blaster 32 CT3600 ISA soundcard needs -5V? It’s similar to the awe32 and awe64 so I’d bet it is the same as those, so if you don’t know about the ct3600, anyone know if the awe32 or awe64 need -5V? If yes for any of these, any idea on the amperage on the -5V needed? If it’s low enough I could build a smaller inverter.

No the SB32 does not require -5V, the only Creative cards that do are the early Generation ones like Sound Blaster 1.0, Blaster 1.5, Blaster 2.0 IE: the CT 1300 series cards like CT1350B.
Basically anything after a CT1600 would not require it.