La Famalia Segrada questions

That is the right price if you want to include going up the tower; and it comes with an audio guide in the price.
http://www.sagradafamilia.org/en/tiquets/

My wife and I were there in late August, booked and printed off the tickets online , we went up the passion tower. You pick the time you want to go , so there is minimal waiting in line . Elevator up but 400 steps going down on a narrow spiral staircase. Interesting views , then we did the audio tour of the church once we came down .

You get to choose the tower when you book the tickets

We where there today and bought the 29e ticket in advance. It does include audio and you pick which tower you want to go up. We chose the Nativity Facade - the elevator takes you up but you walk down 400 step. If that's more than you can do then pick the Passion Facade which takes you up and down in the elevator.

I note that jlhen and dave have given conflicting information about the availability of an elevator for descending from the Passion Tower. Anyone who is concerned about the 400 steps should do more research before assuming that there is elevator access.

If you go on the sacrada familia website and go to purchase tickets it will say there is a lift to take you up the towers and the stairs to come back down . Once you exit the elevator it guides you around so you have to take the stairs down

Or read RS Barcelona book , it clearly tells you which towers have steps.

Both of them!