Curl Chemist says coco betaine will do the trick, and considering her education and background, I'm believing her over any website. I can also say that I've tried even the strongest silicones (looking at you, dimethicone), and have had no issues using only low-poo (or even cleansing conditioners) with coco betaine.

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