I would think that would probably be a much more expensive route than purchasing a rigged boat. But I agree, I'm not a big fan of boats that are married to one outboard company. There are still lots of quality boats out there that give you a choice of motor. I'm afraid that with the acquisition of Ranger, Triton, and Stratos by Bass Pro, the options for boats without a Mercury may become even more slim. Just speculation, though.
Some folks say that fishin on a Sunday is a sin, but if a fish bites my line, you know I'm gonna reel him on in!