I recently switched to 12 10 6 6 10. First is just warmup, so sometimes I'd go 15-20 ... just to get my blood flowing ... very light. I keep changing my routine every month and so far this has been awesome. Before that I was on a 5x5 routine which was really good for strength. I don't like going for 12 reps each set, I don't see the point in going that high. 8-10 is the most I'd go for reps.