I second what Craig and John have suggested. I started with M3s, thinking they'd be the cheapest to return if I didn't like them. Loved them and moved them to the sides, replaced by M60s up front. Somewhere along the line budget went out the window and the quest for audio bliss took over. Got the QS8s a couple months ago - amazing! If you want surround sound, the QS series is the only way to go. The M3s worked fine for surrounds, but they create more localized sound compared the QS8s.
The M3s are fabulous little speakers, but if the goal is to upgrade the mains at some point, be patient and do it right the first time.
