Just to add to the profusion of choice, Air
Glide M and L are available:
http://www.air-
avionics.com/air/index.php/en/products/
air-glide-soaring-avionics/air-glide-display-
l

They incorporate the Butterfly Vario (now
Air Glide S).

Note that the airspace data comes from
OpenAIP. You need to judge how well that
data matches up with where you fly.

Air Avionics has done fine work upgrading
the Air Glide S software.

All you need is the panel space.