I take a boatload, too.

I would not be taking fiber at the same time as vitamins. Fiber can block absorbtion. Agree it's tricky sometimes to find a time to get the fiber down when there's not some dose of something that needs to be absorbed.

Take what you can afford and choose to spend your money on. I play around with the dosages depending on how broke I'm feeling, and usually have to go back up sooner or later.

Saying you take "vitamin C" is meaningless to me unless I know how much. For the competitive challenge in your post, I take 12 grams / day.