Input Needed

The wife drives an 06 Charger R/T with a 5.7 and it gets 25 MPG on the road. With that said the V6 SXT version of the same car should get maybe 30 MPG. It's bigger also so she could haul something if she needed to and it should protect her more in the event of a crash. What kinda a money do we have to work with? That will help on our recommendations.
Small Block