The answer is going to depend on exactly what you're using as no-poo and how your hair feels. Many sulfate-free shampoos (low-poos), and some cleansing conditioners (such as Deva No-Poo or Curl Junkie Daily Fix) contain coco betaine, which will prevent silicone buildup. If you're using a regular conditioner to co-wash, you will need to go by how your hair looks and feels, but there is a good chance that you will still at least need to use your sulfate shampoo once in a while.

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Modified CG since 11/5/11
CLEANSE: CJ Daily Fix, DevaCare No-Poo, CHS Treatment Shampoo
RO: SS Caitlin's Conditioner, CJ Beauticurls Strengthening
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier,Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel