If Stern were making the game, the version you're getting for $6k would be the LE. Start stripping things away and sure you might end up with a cheaper game; but it wouldn't be the same game.
OP, IMHO you're missing a lot, but you seem pretty set on only modern games from 2013 onward. Perhaps look at some of the other 90s era stuff with color DMDs. You seem to like "toys" so maybe a Twilight Zone, Jurassic Park, The Shadow, Congo, etc. If you want something a bit more simple maybe a Fish Tales or Bram Stoker's Dracula. Like others have said though Total Nuclear Annihilation would also be a great pick. It give you that 80s feel with many of the modern upgrades. I personally have room for six machines and my ideal lineup is 1 Modern, 2 90s DMD, 1 Early SS, 1 EM, plus a rotating spot that could be anything. I think that gives me a good variety.
