IMHO, you'd be hard-pressed to beat
Jim's Steaks on South Street. Maybe it's the black-and-chrome decor, maybe it's the South Street location, maybe it's the Cheez Whiz... Whatever it is, it's the best I've ever had!
Amusing story: I once drove from Baltimore to South Street on a Friday night solely for the purpose of getting cheesesteaks from Jim's. I had to pay off a bet I'd made w/ a buddy of mine, you see. Silly me... I thought Green Bay's defense would be able to stop the Vikings on the previous Monday night.