I would just drive the Buick if it were me.
But if I were looking for 2K car I would look for 03-06 P71 Ford Police Interceptor..It will have over 100K miles and few dings but for the most they are serviced reguarly..Most better then a private owner car..You can easily put over 300K miles on those cars doing 140 miles per day..You can get 25 or more MPG on the highway with it..I would be perfect for your 140 mile per day trip..Plus everything in it will be in work working order..For 2K bucks every private owner car will have a million issues..I know a few guys who bought P71'S for beater cars and all were happy with them.
The Buick or the P71 is a lot better then all those little cars that were mentioned.
Over the Christmas holiday I had a lot of company and was in a lot of their rental cars..Some were Corolla,Cruze,Civic,Sonata, Rio,Sorento..All were good short tripper cars but for long trips everyday no way.
Just IMHO.