VTL MB-450 signature versions

I'm considering buying a pair of VTL 450 monoblocks, and my dealer has the signature model with the metal faceplate (no glass) available as floor models (which they replaced with the new version with the autobias and all the new electronics).

Is there a version in between these models?

This is the model I'm thinking of buying:

This is the new model:

And I see some people refer to this one as a 450 model as well:

This model looks like the new model but with a different power switch.