My 4 day split is working better than anything else. But its simple though, stick with it or it won't work.
Day 1 Chest and Back
Day 2 Quads, Abs and Lower back
Day 3 Shoulders and Arms
Day 4 Hamstrings and Calves
I do this 5 days a week. 3 exercises for chest, back, quads, shoulders. 2 exercises for abs, biceps, triceps, hams and calves. 1 for lower back.
I do a set of 30, 20, 10 then two of 6. 5 to 6 days a week. Easily the best workout I have been given and advised to do it by a natural bodybuilder who has trained up a guy recently who came 4th in NSW. He is one of the current BB natural champions. Top bloke and really understands everything.