Looking to get my cab loaded up with any emulators worth having on a cab.  Here's what I'm trying to accomplish:
1.  Launch everything through MameWah.
2.  Use MAME standard controls, including exit on ESC.
3.  Actually play most things cleanly in an arcade cabinet environment -- in other words, I don't want to pack my cab full of emulators that don't run a lot of games properly, have serious issues, or require me to grab a keyboard from time to time, just to say I've got them on there.
In other words, I want to be able to keep the experience as arcade pure as possible, even though there may be non-arcade games on there.  I'd like for someone that doesn't know there's a computer behind it all to be able to look at a couple brief instructions on the bezel or the CP overlay and game away without me there, just using the CP controls.
Right now I've got:
MAME
Daphne
Fusion
What other emulators do a good enough job to warrant putting them in an arcade cab? 
Thanks