3 Level, 40-44" wide, Well built for Isolation-Gear Stand-Where/Who?

Jump on Symposium used ASAP.

Consider Salamander Designs Synergy Twin 30, usually $1119 new.

Or other Salamamder systems.

Not currently in your price range new at 3K, perhaps used when found.  You've invested a chunk of change in your system, I would propose this as more a component than simply a stand.  I run this and the Reference X and can attest they are immediately positively transformative to the sound and not in a small way.

Get one custom made to your own bespoke dimensions and specs like I did . 

here’s mine  in solid black walnut with an isolation shelf for my CDP

  I would get ideas from the Timber Nation site and similar places. Then I’d commission a local craftsmen to build it from a hardwood that pleases you. Also consider if you want it modular/ stackable or just one solid build. I’d also consider keeping it somewhat low and open to avoid reflection and aid in cooling. And then floor isolation , spiked or footers. I’ve also spotted some home built racks that are heavy metal plumbing items and laminated or solid wood combined. They have a pretty solid build and a retro stream punk look. My personal taste runs to a nice walnut item with a Watco finish. I’d love to see what you settle on , please post. Happy Hunting , Mike B.