My take is that flipperless games are as fun to play as a broken gumball machine. At any price.
Gottlieb "owned" the 50's, with what are considered by most as the best play/art packages, with a very few exceptions...Bally's Balls a Poppin and Williams Gusher and Sea Wolf come to mind. Those are high $ games, though. I'd suggest looking for a single player Gottlieb, and there are many that are very good players, too many to list here. I'd also suggest that you avoid reverse flipper games, such as College Daze or Joker, where the pivot point of the flipper is on the inside of the flipper. Also, I don't particularly like the "turret shooter" games like Telecard or Buffalo Bill that have nice art packages, but with wide open playfields (like a pitch and bat baseball game) and no pop bumpers.
Prices on woodrails seem to be declining over time, and you should be able to find lots of choices in the $1000 range, +/-.
Once you see something you like, priced and located right, post back and ask opinions for a particular game.