From Prototype to Production, the simple choice is Sunstone.
Every project goes through the feedback loop: Concept to design, to prototype. Rinse-and-repeat as the prototype tells you what's wrong with your design, and you make change after change after change, spin after spin, never building the same thing twice....until you have something you can take to production. And then? Then, Change is your enemy. Change means you lose control of the consistency you need for your product. Change means you lose repeatability.
The question to consider is this: why would you not keep your production with the same people who sweated your prototypes with you? Who else knows as much about fabricating your board as you know about the design details? Why would you jump to a production house just because you're done prototyping?
At Sunstone, we use what we learned from your prototypes to bring simplicity and reliability to the transition from prototype to production.