Got my lvl3 lumber mill, salvage yard and barracks at the end of last week. Should get the lvl3 War Mill by tomorrow.
After that I'll pool up GR for a bit and I'll change either the lumber mill or my lvl1 trading post. No benefits for the lumber mill, so I'll probable keep the trade post. Then again, it's absolutely stupid that to get the lvl3 20% reputation bonus, you have to be exalted with 3 draenor reputations...Which means the bonus is only really useful to up one or two other reputations, which is retarded.
Anyway, I'll build an inn over the one I erase.