I find that the meat on the majority of beef dip style sandwiches in Los Angeles is bland and tasteless. Most times these sandwiches are augmented by an over salty au jus to supplement the sandwich meat shortcomings. Even Phillipes in my opinion serves up a boring roast beef (don't do the lamb or pork). I slather on the mustard sauce to make these sandwiches tolerable when I do eat there with friends. The best roast beef dip style sandwich I've had was from Weilers Deli on Victory in Woodland Hills, but this was brisket meat. Traditional beef dips are prime rib, rump roast or another cut (I think). So...who has the best roast beef dip in Los Angeles in your opinion, and what are the best cuts of beef when purchasing your ultimate dip sandwich?