First off a couple of brass balls should be clipped on the double sling rack. Something to kill all that time when belaying.
I have a triple rack of all cams, offset aliens are awesome for flaring pin scars, aliens in general rule. Offset brassies are key as well.
Get a really good quality wall hauler, the cheaper pulleys will sap your energy faster than anything else. I don't do much non-clean aiding, so i'm not much help with nails etc. Good luck, have you done any walls yet? It's way more work than you could imagine! Rewarding though!