actually, the new genesis is a pretty trackworthy car. i know a few people with their previous gens that take theirs to track days. hyundai used to be a company as described above, but they have stepped it up in the last few years. The 2013 is a revised version with a twin-scroll turbo making 275+hp/tq (and thats the 2.0 not v6).
and it will likely be cheaper to maintain than an audi (depending on the model/year).