I few people on here have used the Shinko E270 and rate them highly. Possibly Coker Excelsior Comp 400H19 may be easier to get in the USA than Blockleys, it's a very similar tyre? If you are not too bothered about rapid tyre wear there are a number of motorcycle tyres such as Metzeler ME888 and Michelin Commander tyres that work well but only for 3,000 miles or so.
As for rear tyres I like Bridgestone Weather Control A005 and may others use the Michelin Cross Climate, although with the Team Dynamics rear wheel (rather than the Minilite) the sidewall to drive belt clearance can be tight with the Michelin. Don't use the Goodyear Vector 4 Season, it has a "fat" sidewall and will rub the drive belt.
