Rio = 2
Others, no clue as it's been too many years. However, I don't ever recall one I couldn't fix with just a new impeller if I wanted to. The two Rio's I had were terrible from the start. Well, let me correct that: They worked GREAT, until power went out. Neither would ever restart without taking it apart or beating it. Finally finished unpacking and found my old Mag pumps to solve the problem. Now have all external pumps though.
2 was enough for me. Both went in the trash. I wouldn't have even given them to someone else for free.