I'd say to give James and Broken Bow Scuba the business too.
All you big city folks will be pretty surprised at what you'll find way out in the piney woods of Southern Oklahoma. Especially if you check out the back of the shop where they do Hydro testing and such. They have a huge topographic map of the lake on the wall at the shop and you can get some good ideas about the days dives or plan for future ones.
Let the planning begin.....