I would spend all my money at Pride. The other's are all OK but Pride is outstanding IMHO. It also has the BEST view!
Problem with wanting to buy some older vintages is you won't be able to taste before you buy. Do your tasting of the current releases and buy if you like. Or if the stuff is widely available wait until you get home and save some money. Most of the winerys have some stuff that is only available at the winery. Maybe a couple of bottles ot that for the rememberance factor.
Robert Mondavi -Take the tour
Pride - My favorite view and super wines. Call ahead.
Duckhorn - spend $25 and get the special tasting. Call for reservation.
Joseph Phelps - nice grounds but boring wine. Try the dessert wines.
Reverie - ?
Stags Leap Wine - ?
Caymus - Only if you want their SS. But SS is available cheaper off
premis.
Chapalette - Super view. Great grounds. Worth visit. Taste!
Opus One - Interesting building. Just drive in and park and walk around. Go up to observation deck. Look east to Plumpjack, Groth, Silver Oak, Rudd and Screaming Eagle. Don't taste unless you have unlimited $$$. Maybe buy a bottle of Overture for fun.
Pine Ridge - ?
Only one suggestion. You are right in the neighborhood.
Rombauer. Walk around the grounds at check out their collection of caliopes. Also look at the old "Joy Of Cooking" cookbooks. Cozy tasting room. Ask to taste the Zin and try the sweet Joy.