Don't be afraid to ask dumb questions.
I love my Mirage and the 700hp the engine makes. I had heard that the TRS was a stronger drive than the Bravo, so I thought that was good. The guy mentioned that it had a Merc trans instead of the Borg-Warner. The Merc trans is my weak link. I didn't know that the Merc won't hold up to much abuse from 700hp.
Also if it's an older boat, take a 4' straight edge with you to check for a hook or rocker in the hull. I understand a 1/6" you can live with, not much more.