I bring this wine to a lot of wine parties/potluck tastings: (Australia)
It cost $20/bottle and usually wins are comes in top 3 for overall favorite.
Make sure you get the Cab Sav, the other grapes are now where near as good as this one from this vineyard.
All years have been good, currently drinking the 2004 as its the one on the shelf.
Santa Rita's (Chile) Cab Sav and Cab blends from Chile is also very good for a $20 wine.
Also look for South African wines from the Stellenbosh growing region, usually pretty good and cheap.