Cooking with wine

Most people who know will tell you to only cook with wine that is good enough to drink.
That's great in theory, but most of us dont want to dump $20+ of wine in a cookpot.
I like to use wine that I would describe as "just good enough". I also buy little single-serving bottles so I can use only what the recipe calls for without having half or more of a bottle left.

I've had good results from these wines that can be found in mini 4-packs at the grocery store:

Reds:
Gallo Merlot
Gallo Pinot Noir

Whites:
Gallo Pinot Grigio
Ste Genevieve Chardonnay