I was looking at the same issue a while back and among others ran
across the MGL system:

http://www.mglavionics.co.za/singles.html

It looks very interesting, Craggy Aero is selling this one along with
the TruTrack system (http://www.craggyaero.com/solidstate.htm). I
don't have any experience with it, anyone like to comment on the MGL
system?

There was a similar thread a while back which you can find here (with
no info on the MGL system):

http://groups.google.com/group/rec.a...15eb8e7bcde380

Markus