How has this thread become an anti-Mexican tourism pitch? Move on...
On topic.. Seattle has to get a team whenever an expansion happens, it'd be shameful if they didn't.
For the other franchise I'd pick a market out West, probably Las Vegas given the growing brand there. I don't know too much about the geography of the Mid-West but there could be other suitable places.
This would also be an opportunity for the NBA to do away with conferences. 32 teams in divisions of 8 would work. Play your division 4 times(28), other divisions twice(48) for 76 games total which would ease the fixture congestion without removing too many games.
Guarantee the top seed in each division a top 4 seed in the playoffs and then fill it out with the next best 12 records.
Edit: Divisions after the expansion
Division A: Portland, Sac, GS, LAC, LAL, Phoenix, Las Vegas, Seattle
Division B: Utah, Denver, OKC, Dallas, San Antonio, Houston, Memphis, New Orleans
Division C: Boston, New York, Brooklyn, Philly, Washington, Miami, Orlando, Charlotte
Division D: Minnesota, Cleveland, Indiana, Milwaukee, Detroit, Chicago, Toronto, Atlanta