@julesg13th - 460 sqft, that is a BIG room, guessing around 20'x23', and with those high ceilings... Without actually seeing the room with all it's furnishings, etc., I think the size is going to limit you somewhat on speaker choices. Something like the Totem Forest's are going to get swallowed up real quick. And if you want/like off axis performance, then electrostatics (i.e. Martin Logan) is going to be off the table as well. Magnepan 3.7i's would still be possible.
You are going to get a lot of great suggestions from the group and there are a lot of great speakers in this price range, especially if you are willing to go to the used market. Key is to take your time and demo, demo, demo. And before you purchase, I'd try real hard to get a listen in your room first, especially with those 17' ceilings.
I would also budget in a good sub (or two) for the room.
Some other great imaging/soundstage speakers (used) I have heard that could work: Sonus Faber Olympica II's or III's, B&W 804's, Monitor Audio PL200 or PL300.
just my 2 cents....
- Jeff