Another tree I have seen growing here and is supposed to be extremely expensive is Mai Homme - apparently used in the cosmetics industry - we have a couple but I know nothing about them.
I would be extremely wary about planting Eucalyptus, they will cause havoc with your land and despite being a "Quick Cash" crop - you need to think about how to get the roots of these things out once you cut them.
A bit like the Tappioca plants, grow quick but destroy everything that grows near them.