I feel like the 80B games can be really subjective, which is a great thing. I do not really like Tx Sector all that much, which is great because it brings crazy money. I have not played a Robo War, but from what I have seen....i'd definitely like to. Same with Hot Shots. I really like some of the ways Gottlieb used drop targets in these games. The ball save drop target between the flippers on Diamond lady and the knockdown targets they used in Arena were nice features. They also did some cool things like the synchronized drops during multiball on Hollywood Heat. I am also a sucker for some of the music tracks they used in these games.
FYI, you can demo a bunch of the more sought after 80B tables in the Pinball Arcade app for smartphones. Great way to check some of these games out you may never see in real life.