Adventureboy,
If you're serious about the greenlaning thing then you will need to get a more purposeful bike. I used my XT660R for greenlaning last year and had a good time on it but it was too heavy to make me do it another year.
I bought a 2nd hand DRZ400E (lighter and more powerfull than the DRZS and SM).
I can now ride faster, fall off a lot less and when I do I can pick the bike up no probs. I have no worry about denting the metal tank or rounding the underside on rocks.
I ride in a national group (
http://www.trf.org.uk/) and you would be surprised to know that some people ride 15bhp 125 or 200cc machines. While these are not as cool as the latest KTM/CRF/WR competition bikes, they are light enough and low powered enough to use in the wet, mud, bog etc.
Don't get me wrong, I loved my XTR but now that I have my DRZ for trail use, I'll never go back to anything over 130kg or without an 18 inch rear for proper tyre choice.