Here's a good list on which to base your experimenting:

http://www.winejudging.com/medal_winners_2010/100.htm

http://www.winejudging.com/medal_winners_2010/110.htm

I have enjoyed Korbel Natural and Gloria Ferrer

Also, use Bevmo and K&L wines as they are really easy places to search for what you want.

You can easily filter down to the most highly rated and lowest priced items

eg http://www.bevmo.com/Shop/ProductDet...ProductID=5781 is the highest rated under $10

I have it sitting in my wine fridge for the right occasion.