It's hard to pick just 1 or even my top 5 as I love cheese!!! Many have been mentioned already, but here are a few of my favorites
-Cabrales (a Spanish blue often made from a mix of cow's, goat's, and sheep's milk)
-Petit Basque
-Manchego
-Stilton
-Vermont White Cheddar (from Cabot)
-any aged Cheddar
-Gouda (5 year aged)
-Pleasant Ridge Reserve by Uplands Cheese in Wisconsin
That being said, Wisconsin is home to some really great cheese. Yes, I know, the state pumps out much of the average, everyday, grocery store variety of cheese, but there are also a lot of small cheesemakers here, in Wisconsin, producing a lot of world class cheese. Bleu Mont, Uplands Cheese Co. Sartori, Grande, Saxon Homestead, Salemville Amish Blue, and Widmer are just a few of the great cheesemakers in Wisconsin worth searching for.