For those who don't care as much for weight or performance gains, and only want to get rid of the thumb shifters, there is also Shimano Tiagra. I swapped the shifters on my Trek 1.2 from Sora shifters to Tiagra so I could get the lever shifters. I have no complaints about those, and they cost less than 105.
I think next year will be my strongest cycling year.
I started a twitter account @SempreCycling
Bianchi Sempre 105
Sometimes a headwind is really a tailwind, and sometimes a tailwind is really a headwind, to your development. Deep Thoughts.