"Boost" is all relative to air flow. The air flow that CANT get in is your boost reference. If your top end is efficient and flows air well you will see MORE power with less boost. What heads/cam/intake are you running, What are the specs on the heads. LOTS of things come into play when talking "boost"
Basically you should be focused on a safe horsepower amount with your engine.
You can take 2 cars and compare and see that one makes 800hp registering 10lbs of boost, and the other makes 500 registering 19lbs of boost.