I rarely think to have soup, and I should. But that lox & bagel would be a major alternate type of meal for me. I'm afraid I haven't had it in years.
The one place for it that stands out in my memory is Factor's. During the year that I was living in my friend's condo two blocks south (Beverly Dr. at Cashio), it became a regular thing to walk up there for one piled high. My standard is lox, cream cheese, slice of onion, slice of tomato, capers.
That, friends, is as much a mouth-gasming sensation as a great pastrami with thousand and slaw.