You're in a big room, so whether you get Maggie's, Thiel's, B&W's or whatever you need a lot of power.
Your other option is to go with a high efficiency speaker.
The Meadowlark Blue Herron that The Tweek Geek is selling for a friend is also a really good speaker that may work with your amp.
http://www.tweekgeek.com/_e/Trade_Ins_Demo/product/Blue-Heron/Meadowlark_Blue_Heron_Loudspeakers.htm
Your other option is to go with a high efficiency speaker.
The Meadowlark Blue Herron that The Tweek Geek is selling for a friend is also a really good speaker that may work with your amp.
http://www.tweekgeek.com/_e/Trade_Ins_Demo/product/Blue-Heron/Meadowlark_Blue_Heron_Loudspeakers.htm