Erik,
My vote would be Warner Springs, California. Commercial operation
with 15 gliders and 4 towplanes. Closed only 2 days a
year-Thanksgiving and Christmas. At least 50 private gliders based
there-everything from Nimbus to 1-26. Check OLC for the consistency of
year round cross country flights out of Warner Springs. Thermals all
year round and wave during much of the year.

Dean Chantiles "GO"
Warner Springs