Yup Kirkland Presecco is decent. We buy that a lot.
Spanish Cava is pretty easy to find around here, and in that same price range of $6-$8. I tend to like it even better than Italian Prosecco or French Champagne, but I'm good with any of them.
I'm sure I've stated around here before, that my favorite wines are French. Bordeaux specifically, and more specifically than that, Left Bank, although there are some Right Bank appelations I enjoy as well. And I also really like some Bourgogne and Cotes du Rhone.
So, a mix of varietals for me, but what comes through more than that for me, is the soil and environment, or if you want to be a snooty French, the terroir. And, of course, the process associated with each appelation, chateau, or mark.