Well do you have more plans for your Z? Color scheme in the engine bay, different seats? These things should be considered before you make that big decision. Ie/ if you had plans to do some carbon fiber body pieces, then I would say the diamond black, but if you had the burnt orange leather and were going to do your engine cover etc in gold, then I'd say the gold. Personally I prefer the SF challenges over the LE37's in any color. IMHO