Speakers for Home Theater/Audio for 8K

I have recently purchased a Denon AVR 5803 and am looking for a good speaker system. I intend to use the system for HT 80%, audio 20% (mostly straight ahead jazz). Although I have been impressed with the Martin-Logans and have previously owned Magnepans (which I loved, driven with an Adcom GFA 555), the room which the system will now reside limits an adequate spacing for these speakers (placing the front speakers 4 ft. from the wall would truncate the room). The room is 18x24 with 10 ft ceilings. The television is on the long wall with about 4 ft from open passageways on either side. Given some of these limitations, I would appreciate any suggestions. Current systems I have been reviewing include the B&W 802, Snell - Xa90/Xa55cr, Definitive Tech. BP-2000TL. I was ready to purchase the Def Techs but reviewing some of the discussions on this site as well as comments from my audiophile friends made me reconsider my options. I still have not ruled out the Martin-Logans and if any of you have a suggestion about placement, I would love to hear them.

My budget is about 8K and used speakers are certainly welcome. Please suggest any other system that you feel I may find interesting. I realize that ultimately it comes down to taste, but since I have shared some of my previous likes I hoped this would help in the discussion.

Thanks.