man, the updated Sonata from i believe '09 and especially the Genesis are sweet. i've sat in both and things were done quite nicely. back in late '07 i was issued an older '06 Sonata as a rental when my AP1 got rear-ended. the interior of THAT one was pretty meeh. but like i said, the updated version is almost completely different. and yeah, the Genesis is awesome for the money.
although i haven't sat/driven the Coupe i'm willing to bet it's not a far cry from what Hyundai's been recently up to. that, plus the warranty you mentioned, and i don't see why getting one wouldn't be worth serious consideration
i used to hate Hyundai. now, not so much