I agree with dgreenwood. I follow number two which makes my schedule look something like this
Cycle 1
Mon - Bench, Wed - Squat, Fri - Press, following week Mon - DL
Cycle 2
Wed - Bench, Fri - Squat, following week Mon - Press, Wed - DL
etc etc.
If I feel like I have a little extra gas in the tank during the third cycle (the balls out sets) I'll do more accessory work. Also, whatever lifts fall on the Monday after the weekend, I'll add an extra set or two of accessory work on the Wed prior.
So, if next Monday is Deadlift, I'll do good mornings or weighted back extensions on Wed. If it's Bench, I'll do Dumbell Bench or Flies etc etc
Currently dabbling in: IF, leangains, Starting Strength, 5/3/1