What is the best system one can make under $5000


Hi,
I am new to speakers in general and have a couple of decent headphones. What is the best system one can hope to create with a budget of $5000. It is ok to include second-hand components as well. It should allow a turntable and at least one optical input and headphone output.

The listening area is 13ft X 20ft.

Thanks in advance for your advice.

neo_the_one
Didn't somebody at Stereophile call a stack of Schitt and some LS50's one of the best stereos he's heard in the 21st century? 
It seems like exaggeration is the primary tool of a lot of would-be audiophile critics.
"Pair of KH Neumann 310".

That’s 5 grand right there.

Dumb question: What is the difference between a monitor and a speaker/loudspeaker? Is it the same as a powered speaker?
Schitt saga - preamp
Schitt vidar - amp
Schitt modi multibit - DAC
Ohm walsh 2000 mains
Rythmik F18 sealed servo sub
Bluejeans cables
Chromecast audio - digital source, run fiber out to the modi

Can mono block the vidars and get balanced connections if you buy a second one (would need to upgrade to the Schitt Freya preamp, however)