I always thought that it's a misconception that Bill Starr's training idea's is the 5x5. I'd say it's more the whole body routine done 3 times per week based on the Heavy, Light, Medium principle.
And Bill always advocated working toward a final 5th top end set rather then 5 sets of 5 with the same weight. Although I've seen him use rep schemes involving 8's, 5's, triples, double's and singles. Also 3-5 or more sets of 3.
A typical routine I've seen him write is like this :
Heavy Day
Squat
Power Clean
Clean High Pull
Bench Press
Light Day
Squat
Good Morning
Press
Medium Day
Squat
Shrug
Incline Press