So I've decided I want to get an SL and have a couple choices which I need to make in a couple of days. Should I get an SL Comp Carbon which retails for 7,500usd or a barely used S Works model for 11,000? I guess it comes down to whether the upgraded components are worth the extra 3,500usd. Or would i be better of buying the comp carbon at retail and upgrading it? Interested in hearing what you all have to say.... hmm... first world problems..? Thanks for the advice in advance!.. Jon