Originally Posted by
datlas
Depends on how worn everything else is, and budget. If everything else good and budget low, agree get used or NOS D-A, Ultegra, or 105 10s shifter. Use EBay or ask a friend if they have one.
If you want a whole new groupset, the latest 105 or Ultegra are quite well reviewed. You may need to verify rear wheel easy to fit 11s.
I have bikes with 11 sp 105, 10 sp DA (12 yrs. old) , Ultegra 10 sp. and SRAM Red 10 sp (4 yrs. old). The 105 11sp is the best shifting. The rest are all very good but I had no problem with buying my new CAAD12 w/105. IMO the biggest difference between new 105 and DA is weight not function. And, cost of course.