I own the Greem Mountain Callisto. They are at the top of your price range, but are well worth your time. They are easy to drive (I'm using 15 watt of tube power) and throw a huge soundstage. I swear I can hear the musicians play the notes. I have purchased more music and spent more time listening than ever before. They also have a demo program, but be forwarned. I doubt you will send them back. Good luck!
Their web site:
http://www.greenmountainaudio.com/
Their web site:
http://www.greenmountainaudio.com/