I like synthetics in everything.
I run M1 15-50 in my 1200 Bandit. Seems to work well. Definitely shifts better than with the earlier dino fill. Gets rave reviews from users, at least at the Bandit forum.
Shell RTS 5-40, at least the CI-4+ stuff (haven't seen any of the CJ-4 formulation yet), is worshipped by many at the V-Strom forums.
There are a number of MC specific synthetic 10-40's out there to choose from, should you choose to stick with 10-40. Somewhere in the UOA/VOA section is a Blackstone report I posted on Castrol Actevo 10-40. Seemed pretty ho-hum to the guys here. I'm looking at M1 10-40 for my V-Strom when my stock of Actevo is depleted.