The Lund Rebel is an outstanding choice that is close to your price range. Fish and Ski.
http://www.lundboats.com/boat-models/1650-rebel-xs/
As for your other questions .....
I would always choose an outboard over and inboard for the ease of maintenance, power to weight, etc....
The Mercs have come a long way to improving quality with the recent integration into brunswick marine and their new four stroke is an excellent engine by all accounts.
The new Evinrude/BRP's are amazing -
in these mid range sizes they are lighter/faster/cleaner compared to other engines but they do come in a few grand more - so I'm not sure who is offering you a zero dollar upgrade and choice - but if it really is the same price - I'd get the Evinrude/BRP. Zero maintenance for 3 years - tons of low end power, light, powerful.