The Aries Aries
is probably still the best (opinions will vary), the monitor http://www.selfsteer.com/products/monitor/index.php
comes a very close second. The Hydrovane Self Steering Hydrovane Selfsteer
is also very good.
We sail a heavy Schooner with an old (ish) "Lift Up Aries" and love it.
Second hand prices reflect the build quality and the market strenth. If in the USA I would talk to the guys at Scanmar, builders of the Monitor
. If in Europe
I would talk with either Aries
(Now in Denmark
, and non the worse for that) or with Hydrovane
(Used to be in Nottingham UK now in Canada