I used Dukes' speakers in my room in a diagonal set-up at one point. Worked out very well. Here is some more information on room acoustics and speaker placement. If you scroll through the article you will see a discussion on the diagonal set up and some benefits:
http://www.decware.com/paper14.htm
Audiokinesis speakers are compatible with Atma-Sphere amps, I use my Jazz Module with the S-30. The Rhythm Prism's seem to fit your budget at $2500.
http://www.decware.com/paper14.htm
Audiokinesis speakers are compatible with Atma-Sphere amps, I use my Jazz Module with the S-30. The Rhythm Prism's seem to fit your budget at $2500.