Guenoc Cabernet .
Recent years are excellent (2000, 1999, etc).
There are two similar versions: One from "CA Northern Coast" and the other from a particular valley (I can't remember which one).
The coastal "blend" is about half the price ($12 vs $20) and the difference is minor.
I usually stick to CA Cabs and Aussie Shiraz. Both are very forgiving in the $10 range.
In particular, don't forget the Gallo of Sonoma Cab. Changes dramatically from year to year, but overall one of the best bangs for the buck. Can be found on sale for $8. (even in Taxachusetts)