If you find yourself drawn to high efficency, single driver loudspeakers then I find my Cain and Cain Abbys hard to beat and harder for a baby to knock over. They're definitely give you a warm, natural sound--for truely deep bass though they need a sub.
Additionally, I used to use blu-tak to mount monitors to Osiris bookstands, and I can honestly say that it would take a little Hercules to knock those suckers over.