If you liked the Metzler just buy new ones, they have them in stock at Paddocks tel. 02 692 7000
They have Endourance, and a bit more dirt friendly Enduro 3 in stock, plus they have end of year sale 30% off when you buy pair.
None of the tires mentioned above is offroad tires, they're dual sport. And depending of how much you do off the tarmac you choose.
90 or 80 Tar / 10 - 20 off, Typical Endourance
50/50 tires, Typical Continental TKC80 / Metzler Enduro 3
80-90/20-10 tires, Typical Pirelli MT-21 / Dunlop D606
Difference in them is a 80 - 90 tar is 80 - 90% as good as a full road tire on the road but only 10 - 20% as good as a pure offroad tire when you go offroad.
The rest goes by itself really, so as higher % offroad as crappier they are on tarmac and vice versa.
The better they are offroad as shorter they will survive tarmac, my Pirelli MT-21's do good surviving 3000 km on the road, they are so much cheaper it does not matter really in money. However when you ride fast in sand and crap or thump through mud I am glad I use them.
I do not like them on the road tho, still grip and still fine but I keep below 120 km/h with them, and you can see the wear as you ride. Off the tarmac they rock.
In a perfect world we would have several changes with us, anyway I think from seeing what Frank could do that the one you would enjoy the most would be the Metzler Enduro 3.