Quick email or phone call to the coach of his top choice.
"Hey coach, one of the other schools made a great offer and I plan on making a decision by the end of the week. I would love to come to __________, but I can't wait two more weeks. Unless we can work something out by the weekend, I plan on committing Sunday evening."
That's it. They will either get back to you with an offer or they will try to convince you to hold out a little longer. And you don't nor do you have to tell them which school it is. Personally, I would've went home after hearing the "wait two weeks comment" slept on it and then called them back the next day and let them know I committed elsewhere. You are Plan B. Plan A is waiting two weeks for his top choice to give him an answer. What happens when you wait around 2 weeks and they tell you they don't have money or that you can walk on and try out in the fall. Save yourself the time and trouble and move on unless there is significant upside to his top choice ($, academics, etc).