what speakers to purchase

I had a nearly square room with wood floors and it was a bass nightmare. And although your cathedral ceilings will no doubt help, if you're contemplating large floorstanders I'd audition before buying. I agree with the post above that stand mounted monitors coupled with a couple good subs might be the best way to go to avoid nasty room effects or the need for lots of additional room treatments. Either way, try before you buy is probably a necessity in your case. Best of luck.

I second the big B&W's, only because a buddy has them in a similar room and they sound fantastic. He had some amp issues, and finally got them really rockin' with McIntosh 501's (which he got because they didn't sound good with my Maggies) and the sound is very full and coherent. Great high's and mids and very tight bass.

Look at Albert Porters system, the room looks similar to how you describe yours.

Thank you for your responses. I took your advice and went with with Wilson Duettes with stands.Matched them up with a JL AUDIO F 113 sub and Cardas clear cables. WOW I was so impressed with how this system performs with the conditions that where thrown at it.
Now I need to find a music server that gives me not only the best performance but the easiest to use...

Bkoenig,

I use an Ayon S5 network player. It's pretty straightforward to use and sounds fantastic. An S3 would be another option.

Cheered,

John