I'm looking for a set of tires for my 300zx, and I've pretty much narrowed it down to 2 choices. Are the Firestone SZ50's worth the approx. $175 difference over the Bridgestone RE730 ?? I don't race or autocross or anything like that. The SZ50 sounds like its great, but the RE730 seems like a better buy. Also, there's not so many opinions posted about the RE730, since its newer, I guess. Also, I liked the RE71's when I had those on my RX7, and the RE730's are the replacement for those.