We are now staying at RI Sea world for 5 nights and doing SW and Aquatica and also one day at Epcot. Then we are switching to either CBR or somewhere else near Disney to do MK and a few more things(beach, Kennedy Space Center) for 4 nights.
If I were you I'd stay closer to SW for the last few nights. I hate driving back and forth. Maybe you could get a suite for the same price as POP and have more space.
You could rent a car from the car care center at Disney for your last few days and return it to the airport.