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The best advice is to go to an arcade and play every game. Take notes on the games you love the best. Then go back and play those ones a couple more times and narrow your search down like that.
In May, there's an AWESOME pinball show in Allentown, PA. Great place to play pinball AND purchase a game. Also, I'm one of the promoters of Pintastic New England. It's in Sturbridge, MA. 4 hours away from you, which isn't bad at all. I drive 6 hours each way to get to Allentown, that's how awesome that show is.
So definitely take advantage of going to shows. You'll get to play a couple hundred games ALL for free with your admission price. Most of the games will be for sale too, so you can wheel and deal on the price of a game and buy one. It's all a fantastic way to meet some of the nicest people in the world cause everyone is so friendly. It's a real blast and you would really enjoy it.
Anyway, good luck and welcome again to the MaDnEsS!!!