If you could buy any system, regardless of price, what would it be?

’almost’ fully enjoy’. stop reading!

once you reach a certain level, as you have, and I have as well, I buy more music, try new genres,

Add some format you don’t have, i.e. Reel to Reel; LP

Add a function/feature you don’t have,

I will probably change my tube amp to provide safe easy external bias adjustment.

i.e. I was DONE, now, not too long after, I will probably squeeze a 3rd tonearm onto my TT plinth to re-install MM replaceable stylus so I can reduce the hours on my MC when playing/testing old LPs after cleaning, playing fun but not spectacularly recorded content, new or old.

That is a mean nasty question and only someone who is described with a word ending in 'path would ask it.  Just kidding, but I am sure every long term music lover here knows what I mean.  ElliotB has the right idea, buy music!  I would play LPs on the turntable of my microwave if the sound was as good as my main system.  Never lose sight of the fact that he only thing that really matters is the music.

I'd go for Genelec 1036A monitors, 1/4 inch Studer 2 track and all of Led Zep's master tapes. 

NOS Philips 22AR 470