Best upgrade path from Borresen X3s

Borresen X6 would be my choice or whatever speakers you can find used. Good electronics to good electronics does not make that big of difference. 

Figure out how to to integrate a pair of subwoofers or even a single sub...Ime, the Borresen lineup is a bit difficult to integrate with a sub...(maybe Michael Borresen will release a cool sub at some point). Among the existing options, the KEF KC62 or Rythmik FM8 would be a decent choice of subwoofer for that speaker. That could be your single biggest upgrade.

Thanks for the thinking so far.

for accessories I have the first level darkz under the speakers and the Forte3, the sparkz in two open plugs in the power distributor, the A3 power distribution and RJ 45 box, 1 sorta in the Forte USB, and 1 Sortz in the internet box. My contact from my dealer came to tweak my speaker positioning the added each asscessory one at a time. I could hear the background get “darker” with each one. There are more I could add and higher up the chain ones but I’m happy with accessories.

My room is 18x38.

I’m looking to improve my sound with my next upgrade. I imagine I can save $10-$15k over the next year to upgrade, I’ve been thinking the X6 speakers would be logical. My dealer will give me 100% trade in on any upgrades I buy from them for the first 3 years.

The X3 is considered somewhat a sonic bargain, so topping it may be costly. If you like the Borresen sound, then go up the line.  If other brands, it's best to demo for yourself.