Advice on Speaker upgrade vs System Component Upgrade

@gmdodd , In regards to room treatment there are really two issues, evening out bass response and helping the system produce the best image.

Bass traps are worthless. If you have a bad room for bass the only two options that really work are multiple subwoofers and digital room control. If you do not want to get involved with all this stuff the best solution is to move your listening position backwards or forwards until you find the bass acceptable by ear. You might only have to move it a foot or two.   

Improving your image and dampening out artifacts like sibilance requires muting first reflection points throughout the room. This can be done with expensive panels from various companies but also just as effective is really cheap 4" acoustic foam tile. You could probably treat the whole room for less than $100.00! That is what I use but in my case the speakers hide the tile.  As for whether or not the foam tile are aesthetically acceptable is a matter of personal taste.   

OP,

I find the Sonus Faber sound to be the most natural and musical of any I have heard. Hence, I am on my third pair. Congratulations. I think you are headed in a great direction. Tell us how it goes. 

You must give a chance to Wolf Von Langa Son speakers, they re really good!!!

From your post, you may be at a point of diminishing returns. You look to be adding some bass extension. Putting some Wilsons in the space would likely be over kill IMHO. You will be filling your room with bass traps I would imagine. Only you could tell. Anyway. I've recently picked up some Totem Tribe towers. Don't let those 4" drivers fool you. I'm getting a real 30Hz feq response (measured). The only crossover they have is a first order to the tweeters. I drive there 4 ohs with a S300 from PS Audio and if fill my open concept room. 20-30 foot depth and about 15 foot wide, while maintaining a surprising sound stage well past the ideal seating area. Like many bookshelves speakers they simply disappear in the room. Placement is not critical. I tend to use digital sources (CD / stream / NAS) through my NAD dac produces a gentle (not warm) sound. I think the class A analog cell in the S300 really helps.
Visit a dealer and see for yourself. You will be asking yourself... how...? They are not "WoW' speakers, but the more you listen to them the more you will think "WoW" female vocals are stunning. I demo'ed their Element Metal V2s and those are WoW speakers. But could be in the same situation as the Wilsons... too much of a good thing. I listen to lots of Floyd, Led, along with Jazz, Blues, Classical, Opera and the Totems do amazing on darn near everything. I may still be in the honeymoon stage with them, but I would take these over my old B&W everyday. I have a large dog and she can push the Tribes no their isolation feet as she tries to get to the window. A draw back in my mind, but these speaker defy the laws of physics, Definitely worth a listen. May suite you perfectly. 

pennfootball71,

I sent you a PM.