there was a recent thread on the taco about what cams people use...may want to check it out...my personal bias is BD from large to 3/4, aliens the rest of the way all the way to black, I also keep a few tcu's on my rack yellow, orange, sometimes red...
but for the pinns, most people here will down play the fact that you can climb for years there and never really need to place a piece...that said, if you're building a rack, I would get the best (i.e., Black Diamond, aliens) and you'll never be disappointed...
personal bias only...