I am new to this forum, so I apologize if I am posting in the wrong section. I was unsure if I should post this in the Hybrid, Commuting or some other section. I am contemplating purchasing a Specialized Sirrus bike. I ride about 60 miles a week mainly for exercise. I am looking at two different Sirrus models. The first is a 2015 Sirrus Pro Carbon (2014 is no longer in stock). I would not be able to get this bike until September and would have to pay close to MSRP (approx. $3k) when it is released. I also have the opportunty to buy a brand new 2013 Sirrus Limited SL4 at a similar, sightly higher price. As best as I can tell, the benefits of the 2015 Pro Carbon is it is a newer model and has disc breaks. The benefits of the Limited SL4 is it has a 10r carbon frame (as opposed to 8r carbon), Shimano Ultegra Di2 front and rear (electric) derailleurs. It does not have disc breaks. The list on this bike is $5,000, but I can get it at a nice discount due to the fact that it is a 2013 model. Any advice or suggestions would be appreciated.