Planning a Napa/Sonoma trip

[neo-oeno]

My wife and I are heading out to Napa and Sonoma this month. Unfortunately we only have four days to spend between the two. I have been reading through some of the earlier posts in this forum, but would appreciate new input on this thread. It would be incredibly helpful if anyone who cares to comment might post any pluses or minuses (especially ones to avoid) about visiting any of the following vineyards or might suggest any must sees that I have missed. It will be our first visit so we do want to visit some of the standards before branching too far off the beaten path. Obviously this list is larger than the actual number we will be able to visit:

Hess Collection
Artesa
Stag's Leap
V. Satturi
Robert Mondavi/Opus One
Iron Horse
Cakebread
Beaulieu Vineyard
Rutherford Hill Vineyard
Alexander Valley Vineyard
Schug Carneros Estate Winery
Ravenswood
Benziger Family Winery
Clos Pegase
Clos du Val
Frog's Leap
Cline Cellars
Duckhorn
Buena Vista Winery

Thank you in advance for your input!