I used to love plain Ruffles (still do w/ Ranch Dip), but once I moved to PA and discovered Bar B Q Middleswarth Chips, then it was game over. I'll pick Middleswarth chips any day....
Good old Lay's in the yellow and white bag are my downfall! I usually eat way too many, so I limit how often I have them and work hard to confrol the portion. I also love cantina style tortilla chips (really thin and crispy) with salsa.