Quoted from gordonshumway:
Hobbit was a great game, loved the quality of a JJP. When I said I dislike "maintenance", I didn't mean any work at all. I enjoy tinkering, and JJP required not only a bit of troubleshooting, i.e. mis-wired switch, broken wires, or the mods that (should have) been done initially - the flaps, plastics and wireforms. I'm ok with that. I'm spoiled now with the flat panel screen as compared to the small (maybe) colored display. It had excellent glass (invisi) and my playfield was a "10". I can't really fault anything on Hobbit, it was truly a great game. We did however have trouble getting anywhere with the rules and scoring. I've looked at MB and AFM, or Medieval Madness remake as a next? I'm not sure I'll enjoy it without a flat screen (any comments here are appreciated). The maintenance issues I encountered on the "old" machine were simply a 1980's vintage worn out pin that had been worked on, but never rebuilt to my taste. I really want a pin I'll be proud of for our beautiful game room.
Dude, you just got lucky.
Every single pinball machine - even new ones - has potential "maintenance pitfalls." You can go years without an issue, or a game can "break" within 5 plays. Doesn't matter the model or make. The fact that you successfully owned a Hobbit - a known Maintenance nightmare - and had zero issues shows you how inexact this science is.
I don't think you are gonna get what you want here. People are just shouting out the names of their favorite games. The best advice you got here is to go to a pinball show or a big pinball arcade somewhere and just play the games and see what you like. If you want a "flat screen" that limits you to about a dozen games or so these days so shouldn't be so tough to narrow it down. The five JJP games, the Spooky games, and the Stern games built in the last 4 years have LCD screens (I think that's what you mean by "flat?")
I do think you making the right move avoiding "old" games - buy something new, made in the last few years, and you'll be loading the maintenance lottery well in your direction.