Looking for a speaker under $1000. used.

Vandersteen 1c if you don't expect bottom-end extention. Make your next upgrade race to add sub if you do.

ENERGY AUDISSEY 5+2. WOW !

If your looking for imaging and soundstaging capabilites...I would stick with a standmount...and I agree...the Europas are almost unbeatable at their price and well beyond...I also have a room exactly the size of yours...and they easily fill it up...

I have a stand by pair of Thiel 1.2's that I keep just for when I sell my mains and buy another pair. I just recently sold my mains and have been listening again to the 1.2's while in between my new purchase to arrive.
Just tonight as I am sitting and loving what I am hearing, I say to my self. Why did I even buy another pair when these sound so well?. The Thiels image like mad. Nice tight bass. I don't even know how long I will keep the new pair in place.
The 1.2's might be back in action at any time.
The best part about all of this is I paid $400 for the Thiel's. These IMHO beat out the pair that I just sold that cost 8-10 times more!

I agree with the first couple of posters. In fact, as I was reading your post, I thought, Soliloquy 5.0s. Then I read the part about your room size and floor standers and I thought...Soliloquy 5.3.

I'm not a current Soliloquy owner (though I had a pair of 5.0s awhile back) nor am I a dealer.

Based on your objectives and criteria...it's EXACTLY what you're looking for.