As a Philly native, I feel I must butt in and say STFU!!
You want to make a good Philly cheese steak, get the butcher to cut some meat as thin as he can (rib eye or something else tasty). Coat each piece with a little bit of oil, sandwich between two pieces of plastic wrap, then pound it until it's almost transparent. Caramelize some onions in the meantime. Throw the meat in, it'll cook in a minute. A little salt and pepper, put some provolone on it, then put it in some bread. The choice of bread is important, you want a nice crusty roll, not too soft or it'll leak, and not too tough. That's how I like it. A lot of people also like mushrooms and/or green peppers, it's up to you. But a typical Philly cheese steak is onions and provolone (cheez wiz is also popular).
