Sure no problem. There is a ton of info in there and it takes some time to digest. More time if it's new material like it was for me.

I went for the little WhiBal since it's small and I will use it. I had a larger gray card, but it rarely came out of my bag. I had no interest in spending the money you have. I find that what I get from my lab in prints looks very close to what I have on my screen. Now, if they tweak is some, I guess that's fine too. I have yet to do anything that requires truly superior accuracy. But the color balance I am betting using the gray card approach, I think, is very good.