Most Data East and Sega games are sought after these days, don't worry about that.
Some of the best games ever made, and almost every collction has one. Best value and not over-inflated prices like late model Ballys which can look great, but be snoozefests.

Be open minded about all manufacturers and u cant go wrong.
Welcome Aboard,

Tough call.. late model BALLY have some of the best known titles there are.. pinballs most successful period was about 1992 onwards. Bally were king of the pile and for good reason, they made the most successful games, sold more and took more coin. Not sure how you come to the conclusion you do.