I would be looking at the Franchi before the 11-87. I just got back from a shoot where I was able to try the 11-87, SBE 2, Beretta Xtrema and Franchi I-12. Of all of them, I would put the I-12 and SBE 2 very close to each other and well differentiated from the other two. Personally, I am not at a level where I could see a great difference between the two, although I did think the Franchi had less recoil. Only problem for me is the Franchi doesn't come in 3 1/2" (3" max), and I already have an M1 Super 90, so no real need.

I think it would be safe to assume that all Benelli autoloaders use inertia, so maybe the question you need to answer for yourself is whether you like the inertia systems or the gas systems better; then you can nail down the model.

Good luck,