Upgrade from TW Acustic Raven AC-3 to what?

Getting back to the original question posed, why don't you try the new Basis Inspiration TT? It's their finest TT and it looks like a spectacular TT. Basis products have a great reputation for wonderful music reproduction.

On the other hand, have you tried more arm and cartridge combinations? You could even do this with adding a Graham Phantom MKII to the TW-Acustic with a couple of arm wands. Any high end analog dealer in your area should let you try out some of their demo cartridges over week ends. I know that Bryan at Analog Room San Jose, CA lets his high end customers do home demos. Maybe that's a way to get the sound you want without spending another $50K. After-all, you do have one of the very best TT's in the world.

If not that, then go the Walker route.

Good Luck!

Alectiong, Try all the tweaks first then think about getting a Koetsu Coralstone Stereo cartridge and a Koetsu Coralstone Mono cartridge, two Graham Phantom II arms or one arm with two wands and mount your TW...AC-3 on a Minus-K. This is the path I'm thinking about for my TW...AC-3. If this and your tweaks don't work you might think about the mounting your arms and cartridges on a TW Black Knight. Failing that, going another route like the Continuum Caliburn, Cobra and Castellon might be satisfing. Let us know how things go.