This will really depend on your strength level. The heaviest dumbbell Cathe uses is a 30 lb's. The heaviest barbell Cathe uses is 62 lb's, but that is only one for exercise.
I have a jump from 20 lb dumbbells to 30s - I need those 25s - so this weekend I am going to get them, I have needed them for awhile, but I have been spending alot of money this summer....on exercise stuff
Shoes, heart rate monitor, pedometer, new premix series, cardiocoach, and I bought pp/ss - which i LOVE!!!