I have two. One is healthy, the other not so much.
First, the healthy one which is an assortment of nuts: Mostly cashews, but often I add in walnuts, almonds, pistachios and/or hazelnuts.
The other is Tostitos:
I could probably give up the tostitos without too much trouble, but that would probably lead me to eating even more nuts than I already eat. Did I fail to mention that I probably eat at least 4 - 8 servings of the above mentioned nuts every day? Despite the health benefits of eating a "handful" of nuts a day, when one eats them like they're going out of style like me, it really adds up the daily caloric intake.
Basically, I'm looking for some healthy alternatives in which I can reduce my intake of nuts and yet still give me the "crunch" that I need. I don't like pretzels or popcorn, so those are out.