Got the cab! Had to drive wayyyyyy farther than I expected, got lost, didnt have phone reception for like and hour and I worried my Wife when she didnt hear from me. Cab is in pretty good condition, just needs a good cleaning, and I might repaint it and replace the decals. Its 100% complete, its like straight from the arcade, has coin mech, change bucket, huge lock thing to protect the coins. I could go on and on, but for now I will just post some pics!
Turns out its a 2 slot board, have not taken it out yet, but I can clearly see that the battery leaked out, so I am going to assume that is the cause of the green screen.
Metal Slug 5 looks like its in good condition:
So I got the price down to 200, plus 20 bucks in gas for my friend I would say I did pretty good.