If Galil Mountain got you to taste their Viognier, then Ya'akov should eventually succeed in getting you to taste his, too.
Now I haven't had the 2010 yet, and based on comments they made I suspect that the grapes saw a tad too much hang time due to the grower not following that perfectionists instructions to the tee. Additionally, Ya'akov experiments as usual, so that the style is not necessarily consistent from vintage to vintage. His '08 was off-dry while the '09 was dry. Nonetheless, Ya'akov sounds very proud of his viognier, placing it in his highest tier, Adam V'Adama, back in the days of Asif. In my estimation, Ya'akov's is the best Viognier in Israel.