Gotta go with Chick Fillet. Sure the sandwiches are breaded but its a lot of protein. Also, try Arby's plain roast beef.
Now for some REALLY good fast food go to Hardees (Carl Jr.) and get the sourdough bacon burger. Goddamn thing is huge. The sourdough bun is toasted in butter with a thick beef patty. You'll be up at midnight shitting it out, but damn is it worth it!!
errr..I mean I've been told its good. I'm a strict T-Nation dieter and would never go near that type of food!!!