Those tireless product testers at Real Simple magazine went through 85 varieties to come up with these six picks.  Check out the August, 2009 article for full details:
Yellow Corn: Garden of Eatin' Yellow Chips

White Corn: Tostitos Crispy Rounds
Multigrain: FoodShouldTasteGood Multigrain Tortilla Chips
(my personal fave)
Blue Corn: Green Mountain Gringo Organic Blue Corn Strips
Lime: Kettle Tortillas Chili Lime Strips
Spicy: Mexi-snax Salsa Picante Tortilla Chips