Most satisfying system change in 2017?

made multiple, and highly significant upgrades this year. Ordered Soundsmith 'The voice' cartridge,  same time I ordered tubes4hifi SP14 line stage. Received cart 1st-big step up from Clearaudio Maestro. Had some bad luck  in other areas of life, which delayed getting t4hf St120 amp.  Had time to evaluate between changes. These gave me a pretty nice system.  Even at this point, instrument voices on symphonic instruments poorly discriminated, i.e. hard to tell different brass instruments apart, etc.  Phono stage thru this period was Moon 5.3.; spent lot of effort researching, bought a B-stock Whest 30RDT Special Edition.  2nd disc I played was Sibelius; blew me away.  James told me 30RDT would suffice with my turntable, but I bought "My Last Phono Stage'.  This took me to, for me, Audio nirvana.  Not the last word,  but have no smearing, is smooth and even, gorgeous tone, timing, (Avid tt) the Whest shows the drive.  Every album has at least improved clarity and more air/space.  Some things night/day difference.  Classical now enjoyable--didn't listen to much before cause it didn't sound right. Ready to just enjoy listening to it. Took all of them to get it there, but got what I wanted for sound.