How big is the room are you might be moving into?
Reason I ask, is I went through the same decision a couple days ago (I am sure you read the thread). Brent at Axiom basically told me in a room this small it is not necessary to go into the tower speakers unless it's a mental thing for you, or you like things obscenely loud. He told me the whole point for developing the M22 was to allow small to medium sized rooms with a sub have the sound of the towers without having the footprint. That was what pretty much sealed the deal for me. If you go with the W versions the price difference is even higher because you don't have to buy stands.
If you aren't willing to compromise, or money isn't an issue, by all means I would go with the bigger setup. I do like the idea however of what the other guys said... Buy the 5.1 now, and buy larger mains and move the 22's to the 6 and 7 channel later on.
