Well gee. if airports are a criteria, then how about Indy - The Crossroads of America. We've got a brand spankin new airport, not even a year old yet. I hear it's real nice.
And we do host a lot of conventions and such, so if a 100+K FReeprs show up, we can accommodate you all no problem.
My only thoughts regarding Vegas is that there are tons of direct flights from all over the country. It is a pain in the arse to have to make lots of changes. Plus, there are lots of cheap flights and very good rates on rooms. One just has to stay away from the tables if possible.
And the hotel restaurants are very good with very fair prices.
I would love Indy also. Used to live in IN.