Well, I think the best cab would be Asteroids. For one, I think the shape is the quintessential late 70's early 80's arcade game. and second, the control panel real estate is huge!
I picked up a cab two years ago that originally was an Asteroids about three conversions ago, some remodeling later, and now I have a Vector/pinball/Dragon's Lair Machine that works very well.
Occasionally the angle on the control panel wears at my wrists, but fortunately, a lot of the vectors use a similar 5 button control panel, so it doesn't get too bad.
