You must chose between this list of mid-size sedans, which one will be your only car for an indeterminate amount of time. You can’t upgrade the cars on the list to a higher trim, but you can downgrade them (say for a manual transmission.)
Your choices are...
2016 Toyota Camery SE
2016 Ford Fusion SE
2016 Kia Optima EX
2016 Honda Accord EX (4cyl, NO V6!)