Long Term DFW Area PHP/AJAX Freelancer

I own a proprietary piece of web software written in PHP and AJAX. I need a local developer (i.e., within 50 miles of Dallas, TX) to continue working on the project. The project hours will be about 20 hours per week for the first few weeks so that you can familiarize yourself with the code and implement some new features. It will drop off to a few hours per week for a few months while I go after new sales. The software is currently live with one client. I expect to add about a client per month. Each new sale will likely come with web redesign requirements. I expect to be able to resell your services directly to my customers, when needed. My six month goal is to need someone working on the project full time. I've been working on this off and on for nearly 2 years. Now that the product is ready, I want to start pushing aggressively to customers. I need programming support for the inevitable bugs that come up with going live. You must live within 50 miles of Dallas in order to be considered for this project.