The Falcon LS3/5A is quite possibly the best of the LS3/5A litter. I was looking at the Q7 kit myself at one point, but then ended up building the GR NX Studio Monitor instead. That said, if the Falcon is your direction, I'm guessing they won't play as loud as your current HSU's or be a perfect match for the HSU subs. You might find yourself seeking a pair of REL T0 Mk.III's subs to better match the Falcons. IOW, you may be opening a bigger can of worms than you thought. If you're looking for a speaker roughly the same size, consider the ATC SCM 7. It's less expensive than the Falcon, will play louder and "might" have a better chance of working with your current HSU subs. Also note that both the above speakers are quite a bit less efficient (83-84db) than your current HSU's.