@rauliruegas
I can appreciate there are differences in the motors, the start up torque is higher on the new one, but start up time is exactly the same. Basic speed stability, wow and flutter is no better (worse). The literature talks about cogging, everyone knows this was marketing hype by the belt drive brigade to try and undermine specs they couldn't compete with, when DD first appeared. Technics seem to have jumped on this as a way of promoting the new motor. But basic common sense tells you, they could not achieve such high levels of speed stability and wow/flutter figures if cogging was real thing. As for the arm, they changed from one alloy to another for the tube, same plastic yoke and crude fixing method, whoopy do.
Sorry, we'll just have to disagree on this, for me the price tag is just way to high and the attempts to talk up the spec just don't stand scrutiny.
Its a good deck, always was, but you soon hit a performance ceiling when trying to upgrade and you need to jump ship to improve further.
All my opinion of course, but that's what was asked for.
I'm sure the OP will take all opinions into account and make his own mind up.
This is off track from the question of how he can improve what he has.