Zebo, you mention 9 panels, then, vertical boards. They're quite different things.
I couldn't agree more with Homer about panels. Good ones will last, but there are some diabolical cheap ones around. I find these days that a lot of people go for vertical "feather-edged" boards "nail-gunned" to 4 x 1 1/2" rails.
Whatever you go for, follow the golden rule in accepting quotes:
discard the cheapest; also the dearest; then go for the next one down.
Tony: Homer IS equivalent to one-and-a-half men. Trust me ;o)