I am developing a burger recipe for a cookoff with some friends later this year. My favorites tend to be the bacon-bleu cheese variety, so I just need to come up with some different ways to deliver those flavors. (Like mixing bacon fat into the patty instead of using rashers)
LA is the land of the awesome food truck, so my favorite burgers tend to be mobile.
Baby's Badass Burgers, The Other Woman (They also used to have a $15 burger called The Cougar that had aged beef, smoked cheese and truffles.... amazing)
Ta Bom, the Hamburgao
Hamborghini, not the best burgers, but everything on their menu is named after hockey players (The Great One is actually a chicken sandwich, lol), you can get a fried egg topper if you order 'Robitaille style', and the line cook is a PSU alum who gives me free egg rolls.
There are other good burger trucks out here (Rounds, Me So Hungry, Slammin' Sliders, etc)
As far as fast food goes, my list of favorites begins and ends with In-n-Out. Double-Double With Cheese, animal style with well done fries and a root beer. That's pretty much a perfect meal, imo.