I think MPX (Magic Studios / Magic Phoenix) will be offering one very soon, and their other kits are supposed to be pretty good. They’re including canbus for fewer wires, and Tap.
Do you need a full cube, or is the standard 250mm Z adequate and you just need the extra X and Y?
I just finished building mine from KB-3D. Can’t recommend them enough. Their customer service is almost always around on the Voron discord and answered every stupid question I had along the way.
Mines a Formbot and I was very impressed with everything! I don't really like Discord as an information source, but the Voron Discord is full of very smart folks with lots of experience if you wasn't aware!