A new place just opened 2 weeks ago in Everett, MA - Down the Road Taproom. The girl and I will actually be there later today if you're so inclined. They just sent out their game list and it's a System11/WPC lover's wet dream...
(from their email)
"Twilight Zone
Addams Family
Theatre of Magic
Whitewater
Star Trek - The Next Generation*
Scared Stiff
Judge Dredd
Elvira and the Party Monsters
Dr Who*
Getaway
High Speed*
Who Dunnit
Game Show
Pinbot
Bride of Pinbot
Jackbot
F-14 Tomcat*
Currently we have space for 12 games , * games are not on floor(some are being repaired). We will be reconfiguring the room to allow for more game space, hopefully closer to 20 games."
I'd also highly recommend Flat Top as you mentioned. Great staff and always top tier Sterns, sometimes mixed in with something sweet like TAF or AFMr. There's also Roxy's A4cade about 0.75mi walk which has another 6 pins in what's essentially a speakeasy barcade. 6 great pins (similar to Flat Top, mostly newer Sterns with the occasional fun wild card), and a lot of retro games too.