Wow awesome Tao, congrats. This would have been my dream space for two of my favorite rooms in EU, the big Apogees and Silvercore's big horns room that lets you listen to music in every nook and corner. This is going to be just phenomenal.
To the OP, I have always been a fan of two systems, Think ther are a must. Also three TTs, one SS phono, one valve, one OTL, SETs of different tubes, and SS of different sounds - the clean fast one like Boulder, the liquid class A like Vitus, and a good class AB like Dagostino. 4 tonearms and many carts.
Christoph has my system style covered. Pietro in Milan has 4 too, though his Yamamuras stand tall above everything else imo. He also has the Goldmund Apologue.
I really think Mike is falling behind here, he should stop tweaking and take the challenge to repeat his success on a second system