Not to start a BRP vs Yamaha vs Mercury thing at all. But IMO if your ar thinking 115, I would not go with the Merc. Its a very small 3 cyl powerhead. In this hp range I would certainly go with the displacement and look at a V4 vs a I3. The 115HO (130 hp) ETEC should get a look.
That being said, if you are considering both I would certainly go with the V6 150(any brand). You don't HAVE to push the pedal all the way to the floor and the 150 will tote a load much better IMO. Understanding your wanting to not swap controls out, if it were me, I would opt for the 175 Proxs. I would consider the liittle bigger power for resale down the road.
Good Luck and sorry about your PM :-(