Dali Helicon 800 or Acoust Zen Adagio in this room

Need expert advice on speaker size vs room size.

I am considering both the Dali Helicon 800 or the Acoustic Zen Adagio but need some expert advice on which speaker would work best in this room. I have a drawing of my room here in this link to try to make the discussion a little easier:

http://i24.photobucket.com/albums/c26/nnck/Listening-RecRoom-1.png

My concerns basically are this. My top speaker choice for some time has been the Dali Helicon 800, with the AZ Adagio being my second-choice speaker. I love the looks of them both. But I do hear some reports about the difficulties the Helicon 800 can pose in controlling bass in some rooms. My room is sort of odd in that the main listening area is not huge, but the room itself is not closed off either � it is basically connected to an adjacent Rec Room area. The entire area is fairly large, but when people ask me what size my listening room is, I really don�t know how to answer (please see my drawing in the link). The Listening Area of this room is carpeted. The Rec Room is finished with ceramic tile. The entire area is fitted with an acoustical tile ceiling that is set at a height of 8ft.

Would I have trouble controlling the bass of a large speaker like the Dali Helicon 800 in this room? On the other hand the AZ Adagio is a bit smaller overall, and could possible be positioned a little closer to the rear wall. The dynamic range of these 2 speakers are almost the same (I find this almost incredulous, as the Helicon 800 has dual 8� woofers compared to the Adagios dual 6.5� drivers � but I am not a speaker designer). Would I be missing out on some performance going with the cheaper/smaller Adagios?

BTW, I listen mostly to rock (all types from aggressive to acoustic folk) and electronic music of all sorts. Your comments and discussion are all welcome. Thanks a bunch everyone.