Napa Wine Country Wineries recommendations

[tiny ham]

My DH and I are driving up to Napa in the end of July. We have booked a day with the wineshuttle, and the other days are going to tour some on our own.

Wineshuttle is partnered with certain wineries, see link provided below and we are able to choose which ones we would like to see. Are there any recommendations on which ones to pick? I'm particularly fond of Cabs (particularly Aussie ones), and would appreciate some help on which wineries we should choose four our taxi/tour. Here's the link.
http://www.wineshuttle.com/partners.html
Many thanks!