I replaced my Pirelli Scorpions with the same Kumho's you're running and am very happy with them. I very rarely go off road (an occasional sprint across the median when there's a traffic lock-up) and rarely get much bad weather beyond heavy rains. You're going up a bit in cost going to the Yokos or Miches - I'm not sure if there is much of a performance gain plus if you're running V-rated Kumhos, you may be losing out on some sidewall thickness - the Yokos do look BaddA$$ though.

-- John