So you seem to be quite knowledgable on the subject, in respect to ribbon tweeter speakers do you mean companies like Magnepan? I've also been considering their speakers but am currently undecided. In your opinion do you think that the Electrostat's would be unsuitable for a room of this size, if so are I will look into the speakers suggested above.
Electrostats are great with classical, but they will struggle with electronic music and rock. The MartinLogan subs are really awful, I would avoid those at all cost. There are some great subs out there, but with a dynamic driver speaker you generally don't need them. If you really feel you want a lot of bass though, the Paradigm Signature subs are probably the best way to go. Speakers that use the RAAL and Raven ribbon tweeters are capable of incredible detail. You really need to hear them. The Cirrus is possibly the best value of any speaker on the market right now. It's astonishing how good it is. It obviously can't match the sheer impact of a huge floor stander like the Rockport Ankaa. but from about 40Hz on up, its a rival for nearly anything.
A 22 x 9 room is a little tricky to work with, but it can be done. Just keep in mind that the speakers will need at least a few feet from the side and front walls, and you should be 1 to 1.5 times as far away from them as they are from each other.