It really depends on what your goal is, as you never mentioned it in the original post. I, personally, would never go over 12 reps on any exercise. I like to train for both size AND strength, so I mix it up between high and low reps. On all my main lifts (bench, squat, deadlift, OHP), I like to train for strength, so I keep all my reps low, rarely going over 6 reps. I usually end my core lift with one higher rep set (~12 reps), then for all of my 'accessory' lifts, I stick to the 8-12 rep range. This seems to work well for me. Experiment, and find out what works best for you for your goals.