I have a B800, and I’m very happy with it, only the vario, no GCD or Borgelt GPS, just use flight computer to set mcready and ballast.
Dynamis certainly sounds great, but at over $5000 aud + extra on top of the B800, It is very costly.
The basic B800 was much cheaper than the LXs, both kinds.
I’m wondering the same question, looking at an S80 that is for sale here.