Karin makes some excellent points. You could also do an all strength circuit. Alternating 2, 3, 4 exercises in a set, then moving on to another circuit of exercises. I like to do this to keep the workout moving along, to reduce boredom and to give different muscle groups a rest during the workout. There are many different ways you could do all strength circuits (rounds, ascending ladders, descending ladders, upper body/lower body group, etc).
The key is to work to the point where you can not lift another rep without reducing the weight or compromising form.