I put the pirelli night dragon tires both front and back....it rocks!!
They have a shorter life span apparently however it was negligible to me for the trade off, way more traction. Ive had a few corners where I went in to fast and had the pegs scraping and I think it was the tires that saved me from a low side crash. I rarely ride without my chick on the back so if I replace tires in 3 years instead of 4 im fine with it for safety!