I've been to just about all -- Junior's, Factor's, Fromin's, etc. My clear favorite for a pastami on rye is Label's Table, on the south side of Pico a few blocks east of Beverly, with parking in the rear. It is an order at the counter sort of place, with plenty of seating to eat. I order the pastrami fatty, and out comes a huge pastrami sandwich on standard deli rye, seeded with a chew on the crust, with enough meat piled high in the center for at least another half sandwich. All of this for $8.50 plus tax, at least a couple of bucks less than the above competitors for a bigger sandwich. A new addition to my lunch rotation.
No, it is not Langer's. The pastrami is thin machine-sliced and the rye is not as crisp on the crust and soft in the middle. But it is a lot closer, a lot bigger, and a lot less expensive.