I'd love to find a 3.5" Model 27. I currently have the 5" version, and I love it as a range gun.
My preference for being able to carry a revolver high and tight on my belt has led me to favor the 3"-3.5" barreled N-Frames. That just seems to be the perfect proportions of size and weight to have on my side all day. I've got a couple .44's that I'm running now, but a .357 would be a cool addition.