Check out Pi. Your amp can then be downsized as well.
http://www.pispeakers.com/contents.html
I have not heard these, but were I going to do what you are, I would consider these first. (a completely speculative recommendation)
http://www.pispeakers.com/contents.html
I have not heard these, but were I going to do what you are, I would consider these first. (a completely speculative recommendation)