I am going to the Sonoita wineries with some friends next weekend... Callaghan we have been to and is definitely on our list. Dos Cabezas is on the list too, last time we were down there they were by appointment only but we have tried their wines and love them! I have read a little about Rancho Rossa, but do not know anyone that has been there. We are wondering if the wines are any good. We like the two places I mentioned but the other wineries down there have wines that are way too sweet for our tastes... The Rancho Rossa website shows they have some wines that look good on paper, but I was wondering if anyone had first hand experience?