stimpy,

well courte paille could be considered as the same level as buffalo Grill, but honestly try l'entrecote and tell me what you think.
Leon De Bruxelles, are pretty much everywhere, there is one on the Champs, but you go there to eat Moules (Mussles is this how you spell it?) & Frites.

other than that i don't know if you could consider this a chain, but they have really good food are the restaurants of the Relais & Chateaux.

synd