Upgrade suggestions from BAT VK-300xSE

I had Sophias, now WP7's, and ran them for a while with the BAT VK-500, then VK-600. Great bass and dynamics but no soundstage. My recommendation would be an ARC VT100 Mark III or Conrad-Johnson Premier 140. You will lose a little on the bottom end but gain so much soundstage size and improved tonal balance that you will wonder why you ever tried the BAT solid-state equipment. Or if you ever see some used Essence solid-state amps, they are the best I have ever heard with Wilsons. I am not sure what you are using for a preamp, but a tubed job like CAT or BAT or ARC will also greatly improve the sound.

I'm a 300X-SE user who formerly owned an ARC VT100 Mk-I &
Mk-III.
I'm my circumstances (smaller room, lower volume listening) I much prefer the BAT to the ARC.
The tubes generally sound "polite" and homogenized -lacking in color and texture.
I swapped out the ARC for some borrowed BEL 1001 Mk-V monos ($8000 pr.) and was stunned by the improvement!
I guess I'm just a solid-state guy at heart.

I'm leaning towards the BAT VK-31SE (good deals on out-going model) & BAT VK-250, which I will demo. this week, though it won't be cheap at $12K-retail (2X the cost of my VK-300xSE). I'd rather not mix-and-match pre-amps & amps. Manufacturers of this caliber go through a painstaking process when voicing (tuning) these components for optimal mating, and I doubt that I could better. The ARC LS25MKII & ARC VT100MKIII are my second choice, at around $5.5K-used, though I’m hesitant to take on the bulk, heat & maintenance of a very large tube amplifier.

The last time I checked, a VT-100 factory retube (power tubes only) from a dealer costs $850.
This is every two years if amp used daily (1-2 hours) and weekends (4-6 hours).
You can use non-factory tubes, which go for around $400,
and bias yourself.
This is partly why I switched to SS.

i ran a 300xse with my sophias...then stepped up to 31SE/75SE. whole different league at that point. 51SE was an even greater improvement.

good luck!