I am in my 2nd month of riding and am pretty obsessed. I purchased a lower end used bike on craigslist and am wondering if upgrading it is worth the money and effort. I purchased an '09 Jamis Ventura Sport, it has an 8 speed Sora group with an FSA Tempo crankset and an all aluminum frame. So far I have purchased the following accessories/upgrades, Seat bag, Protege 8.0 cyclometer, PD-A530 pedals, shoes for said pedals, a tire gauge and a CO2 pump.
The new 105 5800 groupo was announced recently and I am pretty excited about upgrading my rear drive train components. Can I upgrade an 8spd to 11spd and keep my FD and crankset? If not how high up can I go and is it worth it to get a 6700 10spd over 5700?