Yeah the unit by Multigame is the one that can handle up to 8 JAMMA boards. So far I'm in the research stage and it appears to be the better solution as it allows you to use a std computer power supply and each of the adapter boards have a molex connector.
The other option I am looking at is
this one but it maxes out at 2 JAMMA boards.
I'm pretty sure one of the JAMMA's will be a 9 in 1 with the classics and then I'm torn on whether another board would be a 4 slot MVS or not. I guess the biggest hurdle will be the $. I'm sure I'll have a gun game in there as I have a set of new optical guns laying arround which I will likely side mount into the cab instead of mounting on the CP. It would be nice to have a trackball game as well.
If anyone else is considering a 4 in 1, 9 in 1, 39 in 1, etc board let me know and maybe we can get a freight discount.
The multi boards aren't too bad as far as cost
4 in 1 USD230
9 in 1 USD330
39 in 1 USD530
Here are some of the games that are available on these boards:
Ms Pacman / Galaga / Frogger / Donkey Kong / Donkey Kong Junior / Donkey
Kong 3 /Galaxian / Dig Dug / Magic Brush / Mr. Do / Space Invaders / Pac Man
/ Galaga 3 / Gyruss / Tank Battalion / 1942 / Ladybug / Burger Time
Mappy / Centipede / Millipede / Jr Pacman / Pengo / Phoenix / Time Pilot /
Super Cobra / Hustler / Space Panic / Super Breakout / New Rally X /
Arkanoid / Qix / Juno First / Xevious / Mr Do's Castle / Moon Cresta /
Pinball Action / Scramble / Super Pacman