Hey Mike, welcome...
That is a nice sized room you will have. When you say primarily music, are you thinking about just getting some left/right speakers and then eventually a sub. Or, are you thinking you would like to have a surround setup for some home theater experience? Many music DVD's come in 5.1 so that is pretty cool, but some people just like 2 channel left/right/sub setups.
If you want a surround setup, 5.1 or 7.1, you will have to route some speaker wires to the sides and rear of the room, not sure if that will be easy for you. The m50's, m60's, and 80 floorstanding speakers will give you better overall bass/punch without a sub. However, the smaller bookshelf speakers are no slouch. The m22's and m3's, and even the m2's are respectable. When you add a sub to the equation it will help balance out the overall sound in the room, but some don't use a sub for music listening. Also, if you do some home theater movie watching, you don't need a center right away. Your left/right speakers can simulate the center channel until your budget allows purchasing the center. Also, the Axiom surrounds can be wall mounted or sit on stands.
Keep in mind if you order from Axiom's Factory Outlet, you will save 10%, and if you buy 5 or more items you get another 5%. So maybe you can sweet talk your significant other.
You don't have to get really expensive receivers or amps to accomplish a great experience. There are lots of good receivers out there starting at $400 and up. I would say to stay with a reputible brand like Pioneer, Yamaha, Denon, Onkyo, HK, etc... The Axiom speakers are easy to drive, so I would say look for something that is within your budget, just don't go to cheap. We can help you with that if you do a little research locally or on the net.
talk to ya later
