I too would definitely recommend Q if you haven't seen it, though tickets may be a tad difficult to get.
Also, depending on your age, if you've never seen Rent, I have to recommend that also, it's just a timeless show, no matter how long it's been running or the cast.
Also, again just not having any idea what else you've seen, if you all have never seen Phantom, it's just a classic Broadway experience in my opinion. Lately, it's been difficult to get tickets to though.
Fiddler's pretty enjoyable too, just a great story.
But of the ones you mentioned, and I agree you shouldn't see Hairspray again(then again I'm not as huge a fan as everyone else) then I too would say go with Little Women, it's a cute story that I found to be pretty enjoyable and your friends would probably like it.
"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