Agreed with what the above posts are saying. There are locations out there you should visit. From there, find out what you like. Sterns and Bally/Williams games have different feels. You may gravitate to one over the other.

On the other hand, if a deal stumbles across your path, I'm always under the impression that 'some pinball' > 'no pinball' and even if a theme on a deal may not be a long term hit for you, it gets your feet wet while you visit locations and ultimately narrow down what you like.