I am planning my CP layout and I am kind of limited on space and I am going with a NeoGeo'ish theme with Metal Slug for the cab. The CP is a bit narrower than I like, but it is what I have since I am using a Dynamo cabinet. I am not a big fighting game fan and what ones I do play I plan to just use the NeoGeo 4 button versions. I am trying to squeeze a 2 1/4" trackball in there as I don't have the space on my vertical cabinet. With that said, are there any other must play classic arcade games that require more than 4 buttons per player that you like? The only ones I can think of off hand are the Asteroid series of games and Defender. Both of which could have the left and right buttons mapped to the joystick, so that isn't an issue. Toobin' is one, but again it could be 'faked' with a 4 button layout no more than I would play it.
Anything else?