At the risk of sounding like I've sold out, here is my opinion of the *burgers only* mentioned here so far:
1.) In-N-Out (TIE)
1.) Five Guys (TIE)
3.) Fuddruckers
4.) Burger King
5.) Steak and Shake (but killer fat I remember reading...like trans fats galore, the highest of any chain)
6.) Carl's Jr.
7.) Mcdonald's
NA) Fatburger, Baron Burger, Tommy's, Whataburger, Regina Hotel Guinness Burger (not tested)
Fire Away, I know that list won't please anyone but myself.
And Druff, you've mentioned The Habit before...is that place any good? I was in Santa Barbara once but no one else in my party was hungry...
I think you can eat fast food burgers in moderation and be a rack. Avoid the fries / sugary soft drinks.