With the new and interesting changes at Dakota/Sonic, I liked what I saw at the Miami Boat Show this year. Its been a while since the merger and I bet they have most of the company merge kinks out by now.
I am not sure why Offshore Performance does not appear to carry Monza anymore, but OP always spoke very highly of their products, and the one in the booth I helped them represent was built very well.
Concept does have superior rigging, and hull lines and molds that go way back in performance boating. They seem to have the grasp on folks switching from performance V-bottom boats to performance center console OBs.