I am fairly familar with both speakers- I like the kharma's a lot BUT it doesn't sound like what your looking for. The 3.2 has amazing bass for what it has(i.e. articulate, detailed, body), but it is not the last word in bass reinforcement- the Wilson would have my nod in that regard. Have you considered possibly the 1.0 midi-grand? it seems like it may be more on the same price plane as the Wilson and will have substantially more bass output due to the 12" driver. If you were comparing midi grand to the W/P7 it would depend what YOU as a listener want. The wilson will be more in your face and seemingly faster, with laser like precision in the imaging, along with greater bass output(volume). The kharma will bring you closer to the music, they have an almost sureal soundstage- once you've heard them set up properly you'll understand what I am talking about, fine tuning to the room(along with the right placement) will make this speaker sound MUCH different- its overall tonal balance/accuracy is amazing. You really must listen for yourself to make this sort of decision, also your room is unusual with its dimensions, I am sure it will sound great, its just a little shorter then most rooms that use this type of speaker (assuming you have the speaker's on the short wall firing down the length of the room). 15 feet is a great width to work with, however 19 is a hair on the short side for these full range dynamic speakers- even with that minor short coming I am sure when you get either speaker set up properly it will sound fantastic!
Good luck.
Good luck.