Good luck! Hope it works out well for you.

I've used several client references in the past. If I were in your job hunting position, I would reach out to the client and ask now if you can use them as a reference. A simple explanation that you never know when you may use it but you will let him know if you share his contact info with a potential employer/client is a very professional approach. And if they ask you next week for a reference, you are prepared on the spot.

That's how I won my last gig assignment. I called my references from the parking lot of the client to give them a heads up. Later in the day my reference called me back to give me the heads up that they called. The next morning I was negotiating salary and got what I wanted in compensation.