I O B has a great burger but their fries aren't that great. Someone upthread said to get them "well done". Next time I'm out west I'll order that way. I really like how clean their establishments are and the staff, although most look like high school kids, is very friendly and hard working - I view them as future conservatives!
I hear 5 Guys has a HUGE regular order of fries and that they're very good and even there are a few around here, I have yet to try them.
It's been a while since I've had a Fat Burger but as I recall, they beat I O B for an inexpensive burger - IOM.
XXX is expensive, but it is an elite, you have to go to a place like that sometimes to put the other guys in perspective.
There is a reason they can charge that much for it.