I would say between 2a and 2b (closer to 2b), with solid 2b potential. The thing about curl pattern typing is that there are multiple systems. NaturallyCurly.com uses Andre Walker's hair typing system, which includes references to texture (fine, coarse, etc). It also claims very specific diameters for curls (sidewalk chalk, sharpie markers, etc). Many people don't fit nicely into these categories. The other popular typing system is FIA. FIA includes 3 different pieces- curl pattern (also using the 2a, 3b, etc., but in more general terms, such as large bouncy spirals, etc), texture, and density. It is possible to come up with different results with each system. The other thing to remember is that curl pattern is transient. It can change based on products, technique, and even the weather.

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