I design Smalltalk based computers. As far as I know, I am
currently the only one doing so but in the past we had many
such machines:
http://merlintec.com/swiki/hardware/26.html
It is interesting that the features you are asking for are
USB 3 and VGA output. Other people are trying to convince me
that HDMI is a better option than VGA these days, but I have
been keeping the design flexible enough that you can choose.
-- Jecel