While in dungeons I'm planning on grabbing anything i can. If a dungeon takes an extra 15-30 minutes to get all available resources I'm OK with that. It sure beats having to buy mats off the AH if you need them. Regarding professions i'm planning on having engineering or blacksmithing (I "think" both can open doors but need confirmation), mining, herbalism, enchanting, and skinning represented across the 5 and filling in alchemy and tailoring in open spots. That's the initial plan anyway.