Well I need new back tires and I'm looking for a good sticky tire for the street/track. I was thinking about the Sumitomo High Performance HTR Z II Tire - 245/45-17 or the NITTO Extreme Performance NT555 Tire - 245/45-17. I live in florida, so snow and sleet really isn't a big issue when considering tires. I just don't know which one to get. They're both on sale @ american muscle right now. The HTR Z II's are $102 and the Nittos are $130.