The tax credit brings you a few $K. Entering into an ill-advised home purchase can cost you far more than that.
If you want or need a house, buy a house. If renting is a better choice, then rent. Don't let the tax credit entice you into an action that might not fit your current needs.
Given the negative reaction to your job conditions in the other thread, I suspect you might be looking for your next job as soon as you begin this one. You won't want to be stuck in Duncanville if your next job is located in McKinney.