I have a Roubaix SL4 disc/Di2 - the previous generation without futureshock. It's an excellent bike.

If i were to get something today that would be my only road bike, I'd probably choose a non "endurance" road bike like a Tarmac or Venge but still with disc. Disc wheels allow use of fatter tires, which can be run at lower pressures, which would provide all the comfort I'd need.

My Roubaix has a long head tube, which really helped initially when I was stiff as a board, but over the last few years I've gained flexibility through daily stretching. That has allowed me to drop the cockpit and I no longer need the long HT.