Do NOT get the Joseph Perspectives if you have to place them close to the back wall. They put out plenty of bass, a bunch of it from their port, and they do not do well close to wall boundaries. (I've auditioned them in a space like mine before a few times, but where they'd been set up close to the back wall, and they were boomy in the bass. So I always had the salesman pull them out further).
They need room to breath. Mine are about 4 feet from the wall behind them and they sound beautiful. I could go to 3 feet and they would still work pretty well, but I think it's pushing it to place them closer.