A friend of mine has an Escalade for limo service with visiting celebrities here in Miami. He's had problems with it.
I don't know, but my 2 yo tricked out 4Runner is still pleasing to look at for me and pretty darn comfortable. Back seat folds flat. Very handy for me, since I'm often carting a lot of stuff.
If not, I'd probably go with a slicked out Yukon. That was my 2nd choice when I bought the 4Runner.