What would you upgrade next ??

My system is finally sounding pretty good. Actually gives me goosebumps. But I'm always looking for the "weak link" in the system. I'd like opinions on what to upgrade next. I'm looking for retrieval of micro-details, air and space around each instrument and voice, 3D imaging, "palpability" of all the voices and instruments. Here is my system:
CDP: Arcam FMJ CD23T
Pre: ARC SP3c (complete upgrade/restoration at factory)
Pwr: ARC VT100 MkII (just re-tubed)
Spkrs: Acoustic Zen Adagio
Sub: Focal JM Labs SW900
Interconnect and Spkr Cables: Analysis Plus
Other: Speltz Autoformer set for 2X, use 8 ohms taps.

Thanks for your inputs.
MABonn