+1 on the FullBores. Just love 'em.
American Moto Tire now carries them as well. >$150 for a set.
They come from a modified mold of the 705 from Shinko, but different compound. The 150 rear is a V-rated radial.
Sure, they won't last as long as a K60, but hook up as well on and off and basically half the cost. Plus everyone complains about mounting and dismounting the K60's and the M40/41's are a piece of cake. Knob height is slightly less as well. Did I mention they are half the cost?