The M&P 9 Pro or 9L is the model you want. It's 5" barrel with a longer site radius makes it very popular.
Being in Oklahoma you have access to a lot of shooting close by in Tulsa, OKC, Ft. Smith and Joplin.
Here is a list of all the matches in and around Oklahoma. If you ever need any help getting started don't hesitate to give me a shout.