I've always liked the push/pull routine ..... chest/shoulders/triceps, back/biceps, legs.
I also like Chest/Back, Shoulders, Biceps/Triceps, Legs.
All depends on how many days per week you want to train and how long you like to train. Me personally, right now I am doing 2-3 days ifting and doing more of a circuit-style lifting. I am focusing on compound movements, VERY little isolation, and doing legs between sets (lunges, free squats, no weight at all). Enjoying it, but will eventually go back to a traditional split, but even then, legs will be an "extra" day and done with very little weight (if any). Eventually want to go back to doing a plyometric day as my leg day.