Since you're in DC, you should take the family out to VUK Pizza in Bethesda, MD--it looks to be within an hour's drive. They have tons of awesome pins including some of the newest: Guardians of the Galaxy, Houdini, and my personal recommendation: Total Nuclear Annihilation. I haven't made the trip there myself yet, but I've heard nothing but good things about the place.
As i mentioned, Total Nuclear Annihilation (TNA) would be my pick. I've been following the production of it very closely, and it really looks to be a well-built, well-designed, and above all *fun* game. Their tech support is the best in the business, from what I've seen so far. Plus TNA has some really cool features, including a custom stereo that utilizes the cabinet for optimal bass, and an awesome soundtrack of original music by the game's creator. Code is past 1.0 at this point, and has been updated numerous times since release, even adding new features such as cooperative and team vs. team modes. I seriously could go on and on. With all the optional upgrades, i expect to be in around $6800 +/- when i take the plunge. I think the resale will be decent, but I'd expect to lose at least $500+ on any nib game when reselling.
Take that with a grain of salt, of course--the game's not necessarily for everybody. I've already decided to make it my first nib game, and i haven't even played it yet--so there's that too...
So get out to VUK or another pinball place and find what you like! There's tons of great choices out there, and many more on the way by the looks of things!
Welcome to the hobby...be sure to make room for more...because there *will* be more, the way this appears to be going!