Sebastiani - seems to age well
I've had two sublime bottles from Sebastiani in the last year. A 2001 Cab and a 2002 Merlot. Both were from the "Sonoma County" brand of wines selling for $12-15. In both cases the wines picked up an elegance and complexity unforseen by me. The Cab was soo smooth with great balance yet still very flavorful. The Merlot had the most intriguing flavors of smoke and chocolate, with a fruit and an herbacious element.
So I've decided to keep buy the Sebastiani wines and to stick them in the cellar for a few years. They seem to age very well. And at $11-13 a bottle, that's an investment I can make.
Note: I just bought 4 bottles of the 2004 Cab from Costco and thanks to a $10 coupon, they were $10 a bottle.