Most satisfying system change in 2017?

Doing major upgrades to my Naim system.  I replaced my Naim NAP 250 amp with the NAP 500,  I replaced my Naim CDS-3 CD player with the Naim 555 CD player with 2 power supplies, I replaced my Naim 252 pre-amp with the awesome Naim 552 pre-amp, and I just ordered a pair of Grandinote Mach 36's to replace my classic Linn Isobariks. 

@inna 

ill try those out. Should be able to source those via Craigslist easy enough. 

For me "roon"
It's Sooloos Meridian without the price tag, but better--the generation for high end

Here is a review.
https://www.google.com/amp/s/www.techhive.com/article/2923915/home-audio/roon-is-must-have-software-...

Built speakers, TMW config.  Crossovers are modified from Icon Parsecs. Drivers from Seas, ScanSpeak and Audax.  Stunned at the results.  IMHO they compete with factory towers @$10k. 
(Unavoidable pride/bias I suppose, but verrry gratifying project). 
Timbre and detail..can’t get any work done cause I can’t walk away. 

Iwal22, can relate.  How did you solve potential cabinet issues?  Biggest challenge in my experience.  Pictures online somewhere?