Personally, I think that the Definitive Tech are some fine sounding speakers that handle HT very well. Since, you have the budget of $6,500 why don't you try the Newform Research speakers. It is a full line of ribbon speakers that is very transparent, quick, dynamic, and superd soundstage speakers. It can only purchase factory direct. Check it out: www.newformresearch.com
Speaker Suggestions
I am currently using the B&K AVR202, with a Marantz 930 DVD, Kimber 8TC cables and Wireworld Interconnects. I am using a Definitve Technology setup all the way around and looking to upgrade. I have about $6,500 to spend on all speakers including a sub. My room is 25x17 with 25 foot ceilings. Any advice?