A friend swears by the Joel Robochon L'atalier. No clue if it is still open and what it costs, but apparently reasonable and worth the time spent going there.
The last time we had this discussion it was at the landmark.
I can attest to this, I tried one of their roast beef sandwiches yesterday along with an English breakfast tea. The bread was properly crusty and a had a great texture, with the crumbs splattering everywhere on the table as I bit into the sandwich. The tea was nice also with a biscottii included, always appreciated.