Kris--If you are leaning toward the 110 and you can wait a month, the 115 will be out. That is what I would choose.
All the above mentioned engines a fine, but he 110 (new 115) is 2 lbs lighter than the others, thus allowing the use of cans without weight penalty. I would say it has more power than all except the 106, which I "FEEL" it is equal too.