In my opinion, most of the single player reverse-wedge head Williams titles of the early 60's are great. More than great in some cases. Trade winds is my personal favorite. While difficult to find, they are worth the search. Teachers Pet is also a very fun game, I had a hard time getting a decent one of those too though.
On the flip side, there are not many Williams titles from the 70s i would want, but doodle bug is a great game. I'm overall not a huge 70's pin fan, nor am I a fan of the "pointy people" look, but the game play of doodle bug speaks for itself. If this is a title you are seeking, PM me.
I always give every game a chance, but overall the small flipper games are what I enjoy most.
On the Bally front, I have a 68 Safari that is a 2 player game and is very fun, there is a Bally Wild Wheels for sale in Red Bank NJ right now on CL. Not many good 60s Bally games come up for sale often unfortunately. Moon Shot and Star Jet are two I wouldn't mind owning.

Agree 100%

I would not go so far as to say that! I think a nice diversity is what makes a complete collection. I may be biased as my collection tilts the scale towards Williams games, but to each his own. I think lack of exposure to the good Williams games in good condition is mostly what keeps them the hidden gems that they are. They can stay that way as far as I am concerned, more for the pickin' of us 60s Williams lovers.

I was going to say Williams King Pin, but to be honest, I had SUCH a hard time finding a decent one, let alone one at all, I wasn't going to put it out there with false hope of finding one. Really surprised this fell short of what you were looking for though, its really up there on my list of favorites. Only complaint I have on Magic Town is that they didn't use different art work for the playfield from Magic City, looks makeshift IMO. Ive never actually played Magic Town, but do like Magic City. Let us know what you decide!