Thanks for all the responses. The agent offered me all 3 options as alternatives. However, since my flight was booked as 2 one ways she could not change my flight back to an LAS-ATL direct and even though the chance of a reroute etc is slim, I didn't want tO risk ending up having to connect via another hub and having my car at ATL. Ended up getting rebooked on a flight that leaves in the morning and gets me there about 7 hours earlier than my original flights. Thanks again.