My cab has:
MAME
Makaron (just use Demul since you have the horsepower. You stated that Naomi/atomiswave is covered anyway)
The Naomi shmups run better on it since my hardware is old.
Model 2 Emulator - Dead or Alive, Dynamite Cop, Fighting Vipers, Last Bronx, Pilot Kids, Sonic the Fighters, Virtual Fighter 2, Zero Gunner. I play zero Gunner and Dead or Alive most. Don't have guns on the current cab, but has some must have light gun games if you have the hardware.
Supermodel - Fighting Vipers, Spikeout
Taito Type X, X2 (not really emulated, cracked PC based arcade games) - Raiden III-IV, Tetris Grand Master, Super Street Fighter IV, King of Fighters XIII, KOF Maximum Impact, etc.
I don't recall which emulator it runs on, but I also threw the dreamcast version of Soulcalibur because it is good enough to be included. The cab has no other console games installed on it.
Probably forgot something. I'll follow up if I remember.