For me it's 1 simply because I only have the space for 1 system. I'd love to have a 2nd system to tinker with. I own two streamers, two Dacs and two amps at the moment so I am most of the way there but no place to put it!
Quick System Building Pop Quiz:
Please choose 1 option below and maybe explain why:
1) Make your already very good system even better
2) Start a second system to play with and maybe try something new or different