I don't understand
the new naming system they have... although I did ride the Definition
- good stable board, very stiff and amazing edgehold, probably good
for BX as well, but it's just a little unwieldy are lower speeds.

Forecast is essentially the renamed 450, or at least it was the first year!

Another Salomon choice might be the Fastback, which is marketed as an
off-piste board but when I rode it several years ago it was actually pretty
carvy. I don't know if that comes in your size though, they tend to come in
bigger sizes from what I can remember.