I love potato chips. They're like the veggie brother of bacon. I almost went to MIT instead of Stanford because I fell in love with Cape Cod Chips when I visited Boston. Really. (Thank goodness I didn't since by senior year, we could get Cape Cod Chips in Palo Alto. I got to be in shorts in February and eat yummy chips. Top that, MIT!)
I've eaten potato chips around the world and loved almost all of them, but the very best chip (or should I say crisp?) in the world are Cheese and Onion Tatyo Crisps from Ireland. These are the most popular crisps in Ireland (the dark horse is Kings, made by the same company and very good, but just not world class.)
I typically shy away from flavored chips, but these don't hit you over the head. They're thin and crispy like Lays (vs. the heavier crunch of Cape Cod or Tim's). Simply heavenly with a pint of Guinness.
They have a "smokey bacon" flavored chip too which I have not yet tried; those might actually be the best chip in the world...
For years, I've relied on friends traveling to Ireland to feed my need (thanks to Fergal to bringing me back a few bags recently to remind me of the old country). However, I just discovered that you can mail order Taytos from Ireland to the US. Of course, they're not cheap. US$20.59 for twenty snack-sized bags plus $31.88 shipping to Seattle (ten day service).
This is an affordable luxury and a small price to pay for such delight.