I'd run a E09 over a MT21 for adv rides and a D606 over a T63 over a MT21 for mixed adv/trail. Problem is that the MT21 is the only one that acutally comes in the right size for a 690 (or 950) though the 690 could probably run a 130/80-18 (or equvalent) i.e. T63 or D606 or E09.
Of couse if you want full blooded trail/dual sport tyre the AC10 does come in the right size (120/90-18 is basically the same as 140/80-18 - I've got a AC10 and MT21 in the garrage) and is cheap as chips compared to any of the tyres above.
"The ultimate result of shielding men from the effects of folly is to fill the world with fools." - Herbert Spencer, English Philosopher (1820-1903)
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