I should clarify what my front wall looks like. If you are staring at the front wall, 2-ft 4-inch from the floor the wall turns horizontally into a ledge, after 1-ft of ledge it again goes straight up, to the ceiling. In other words, there isn't open space underneath the ledge.
A question I have always had about the Larsen - do they have to be flush against the wall, or can they sit off the wall? In my case, something like the first 2-ft 4-in of the Larsen could go flush against the wall, but anything after that would be 1-ft off the wall. I'm sure I'll know the answer once I audition them, but doesn't hurt to ask here.
Also, yes I do have an interest in the ATC speakers. I may even extend the budget a bit, to find used ones that work for me.
Amit