Have a look at Paul Remdes page -
http://www.cumulus-soaring.com/
for PDA /GPS set ups. Many options, many pretty cheap and great
support. Wing riggers are not cheap.
www.wingrigger.com looks like a
good choice for bang-for-a-buck but will still run around $1000 with
shipping. I think you could fashion your own tow out gear or have
someone do it for pretty little $. I'd be happy to send you photos of
mine (ASW15) if you'd like.
Mike
ASW15