Some random thoughts on some of the games.
Spot Bowler - seems one that is super hard to find and very popular.
Hawaiian Beauty - lovely looking pin, unique layout and a rebound special which is pretty cool.
Diamond Lill. A tough game to beat, unique layout, reverse flippers, very little luck, more skill based and probably the best light show in any em ( just my opinion ).
Ace High. Hard to find, great artwork, and possibly best game from 1955 - 1960. I grabbed one while I could but not shopped yet so can't comment on gameplay but the rules and layout look pretty darn good.
Auto Race seems hard to find and is very popular with those who collect cars due to the great artwork.
Tough to choose 3. It's usually availability and condition/price that determines.