I'm also in the camp of any good brand name full synthetic oil that meets SN and GF-5 specs.
For that warm fuzzy feeling inside of having chosen the best oil from a bunch of good oils I'm looking at the NOACK measure - coming to the Twins from a turbocharged direct injected platform (Focus ST) that was a common argument that lower NOACK better protects the turbo and help with carbon build up. With no other real objective ways of differentiating between oils (other than price), I'm going by that and using Castrol Edge.
PS don't forget to ask if you should use 0W20 or 5W30
