TBQH there may be better tyres out there, they may be twice the cost but I question if they are twice as good. The maxxis supermaxx st get a big thumbs up from me. When i look at the costs in use of my motorcycles, tyre expenditure is low, mileage is maximised, the odd inconvenient wheel change is required at mot times for my dry use bike and there is still loads of rubber and grip left ( on a dry road) on tyre that has gone below the legal requirement. Tread is mainly for water dispersion. At lean where grip is important there is loads of usable legal rubber left either side of the tyre centre especially on the rear.
What i have noticed in changing my own tyres is that maxxis supermaxx st is a feckin tough tyre and resists easy fitting and removal which I think is due to the steel plies in the side wall. Tyres with nylon plies in the side wall seem to fall on and off voluntarily when you wave the tyre levers at them.
What i do not advocate is using slicks in the wet
What i can recommend is changing your own tyres, it gives you a great opp to clean up and check your discs and calipers, greater choice in what tyres to buy and the convenience of doing it in your time. Recycling is the only constraint (errrr.. and forgetting to torque up your wheel nuts) a good Staffie helps to get further use out of an old tyre.
Chris