traudio,
I'd suggest you speak with Clayton about any recommendations from him, and glad he'll be at Axpona. I'll be there on Sunday and speaking further with him as well.
I have found that they need to be pulled out into the room, they start dialing in at about 2 feet into the room....but prefer about 3 feet I believe. Also they sound best when they have about 2 feet from side walls. This is my first pair of open baffle, and it's been a slight learning curve....but what a revelation.
My current room is not ideal, but they still are the best speakers I've ever owned; by a good margin. I've put a review up here on Audiogon if you want to search, it's pretty detailed. Right now they are being driven by a CODA S5.5 amplifier, and the music is truly amazing......I have a review for the pairing as well on the CODA S5.5 thread.