You can probably get about 12 cheese Krystal's for about the same price as a Five Guys burger and fries. On most days, I'd take the dozen tiny steamed burgers. But, I'd also argue that Five guys sits more on the restaurant side of the aisle, not with the fast food places. It's somewhere in between I guess, but definitely a step up over fast food.
This made me hungry for Krystal's... I like to grab a sackful from there about once a year... and it's been about 3 or 4 since I remember doing it.