Pay a little more, get a better board. I've been using Sunstone for many years and the results are consistently good. 6"x6" 4-layer board with a 1-week turn marginal cost $50 per board. Compared to how much time you will spend figuring out that the PCB shop blew out one of your plated holes, it's a bargain.
Sunstone is still exorbitantly priced for what you get. U&I in Korea can do that spec faster for cheaper ($35 each at qty 10, with 5 working day turn, 7 days delivered), and the quality is better to boot.
I really don't see any technical reason to prototype with US fabs anymore. People who insist on doing so are just wasting time and money. I understand not wanting to do to China, I really do... but there are other options than just China.
