You sound like my hair twin I'm also 2c/3a and very low porosity.
For cleansing and conditioning, I LOVE Shea Moisture Raw Shea Butter Moisture Retention Shampoo and Shea Moisture Restorative Conditioner. I only started using them recently, but the shampoo isn't stripping at all, and the conditioner (which I use as a leave-in) helps a lot with smoothing and definition. They're fairly inexpensive, too, especially compared to Deva.
2c/2b with some 2a, coarse, dense, thick, low porosity
Growing out a CL bob. Currently at APL.
CG again as of 7/20/12

Cleanser: BRÖÖ Smoothing I.P.A. Shampoo
RO: Trader Joe's Nourish Spa Conditioner
LI: Kinky-Curly Knot Today
Styler: Beautiful Curls Gel for Wavy to Curly Hair

all-natural products, light moisture, humectants, argan oil
silk protein, synthetic ingredients, heavy oils/products, cowashing