The bulk of the colors can actually be "tinted" (at least slightly) by the "darkness" of the primer you choose to use as the base coat, dark colors not so much, but light colors can change a lot. EVERYONE has a different method to obtain the finish/shade they are after, and I've always been all about "what-ever-works-for-you"....... from past experience, have always chosen white primer under brighter/lighter colors and gray under darker colors to try to obtain "depth". If you are REALLY trying to end up with "something to take pride in", I would definately side with the guys who are suggesting the test panels to acquire exactly the color-depth/tone you want for your end result. GOOD LUCK, we are watching to see how you come out.
DJ