Axle and prop shaft seals would be good to do while the transmission is out. On most cars the transmission input shaft seal is recommended, but that's not changeable on this transmission without opening up the transmission case.
Given that you have to pull the engine out to do this job, I'd consider doing a timing belt, cam/crank seals, and replacing the "hoses from hell". All of that is so much easier to access with the engine out of the car.