trying to upgrade speakers

Green Mountain Callisto. I listened to all the speakers you have mentioned and the Callisto was the one I went back to every time. I waited two months for mine to be built and it would be worth waiting a year. My room is approximately the same size as yours. The Callisto is NEVER fatiguing, always enjoyable and still amaze me how musical they are. Most enjoyable speaker I have owned in 30 years. They play all music as a speaker should at all volume levels.

Does the dealers do a home demo program?

http://www.6moons.com/audioreviews/gma2/callisto.html

Check the Green Mountain website. There is a dealer in New Jersey that is recommended or call Roy or Janet at Green Mountain for more info. The new website is in the works and new dealer list is coming out soon. The Calisto throws a huge sound stage and deep bass with the dual bottom ports. I prefer the Calisto over the Maggies and Eminent Technology LFTIII that I owned.

http://www.greenmountainaudio.com/

Good luck!