Upgrade 120

[ogs]

As you can see from my sig I own a 250 so my response may not be fully valid for your situation. I have done all the upgrades as they became available (my amp started as a D-Premier). The step from 250 to 250 Pro was profound. When the CI board was installed everything was refined ref the Pro upgrade, but the difference was not as big as 250->250 Pro.

It all boils down to what you are prepared to pay. I am sure a 140 Pro CI is very good indeed. With the recent introduction of the 210 dual mono (2x140 Pro CI) this is a good option for future improvements. I'd still recommend jumping to a 220 Pro CI if you can. It is probably a better amp, in particular if you do not see dual mono in your future.
The CI is already a UPnP streamer. Roon supports Devialet AIR (I think AIR is also supported by Roon on your 120). Roon RAAT for the CI is announced and should be here within the next 6 - 12 months. Good luck!