Well your past shows seem to have all been more comedic, happy, nondramatic shows. I'm assuming you're looking for more of a show like that than one where half the cast dies?
Going by that...I can't explain why, I've never done it, and I wouldn't call it one of my favorite shows, but Kiss Me Kate is what's coming to mind. There's some nice dance numbers there, fits in to the comedic/happy pattern, the leads have to be good but not necessarily star triple threats. I'm sure you can figure out some way to get sets and costumes to not be huge.
Oh, and I very much agree with not doing the Boyfriend. Did not like that show at all.
"If there was a Mount Rushmore for Broadway scores, "West Side Story" would be front and center. It snaps, it crackles it pops! It surges with a roar, its energy and sheer life undiminished by the years" - NYPost reviewer Elisabeth Vincentelli