When going on a Sust cycle, it is my opinion that you should try to stack with an AS that you can add to your syringe to ease the pain often associated with sust injections. Personally, I like using EQ, and Dbol with sust, and using a anti-aromatase like arimidex or proviron along side. The Dbol will add synergy to your stack as well as kick it off with some strength & size gains while you're waiting for the Sust/EQ to kick in.
Another good option: Sust/Deca/Winny
For cutting: Sust/Tren &/or Anavar/Winny