Chips are my downfall, otherwise I eat pretty healthy.
Potato chips- regular(usually the low salt type!), sometimes barbecue. I don't eat a whole lot of potato chips. Flexible on brands, but somehow usually wind up buying Lay's products.
Tortilla chips- regular, round or triangular, white or yellow or sometimes blue corn, house brand or national brand, whatever is on sale. Love 'em, with salsa or cheese or both or whatever or alone. Recently, got a few bricks of Cabot's Chipotle Cheese on sale- that chipotle cheese on tortilla chips = almost heaven. I'll include Fritos w/tortilla chips, when I do get Fritos it's usually the half-sodium type. I actually prefer these *strongly* over the regular full salt Fritos. To really improve *any* corn tortilla chips, heat in the oven for a few minutes before eating.
Other: by far the least healthy, I suspect, are the Cheetos, the original Crunchy, not the namby-pamby Puffs. Nuclear nitro orange cheese powder, mass quantities of salt, probably pretty bad for you- and I do love them so!
On all the other stuff, I'm flexible on brand- but for Cheetos, only the original Frito-Lay Crunchy will do!