Arrived at AUS early this morning, just after midnight. I had a midsize reservation, so went out into the President's Circle area. While fully-stocked, it was all sedans, with nothing fun. Basically a mix of Toyotas, Nissans, and Hyundai midsize and fullsize cars. I saw an Impala Classic LT

parked there as well. I didn't see any higher-trim models, mosty base (no leather, sunroof, etc). I ended up taking a YF 2017 Hyundai Sonata with working XM/Sirius.
I poked around the Five Star lot to see if there were any hidden gems and found more of the same, with some Dodge Darts thrown in.
I didn't bother to check the tags of the cars in the upgrade area to see how much the upcharge was.