I have ridden many different types of bikes over the years and I love my FZ over all of them. Its a great all around street bike. The N conversion will run you about $700-$900 in parts. Go here for more info. http://www.yamahafz1oa.com/index.shtml
looking at these rears http://www.motorcycle-superstore.com/4/30/397/12419/ITEM/Dunlop-KT805-Quadmax-Rear-Tire.aspx and the fronts http://www.motorcycle-superstore.com/4/30/397/12417/ITEM/Dunlop-KT801-Quadmax-Front-Tire.aspx Gonna run about $260 with free shipping.