While I like pinballs of all eras (though admittedly I can't say that I have played many from the 50's or earlier), there are almost no "new" games that I would even consider purchasing (except for the CGC remakes).
Maybe if I had room for 20 or more machines, I'd be willing to consider a DP or BM66, but as I can only fit a few games, that's not going to happen.
My favorites are the 90's B/W, but I also love a lot of SS machines (like EBD and Centaur) and EM machines (like Atlantis and El Dorado).