I thought about this a few years back - at the time I had a rented house with a fairly damped living room. I was 5m away from my speakers.
These days I'm about 2.5m away from my speakers and they are a lot brighter sounding than they were in the room we had when I bought them. In that same room, I compared my current B&W 705s to the DSP5000s (smiley faced IIRC) and found the 5ks to be too laid back.
Now I'm wondering whether they would suit me better in the smaller rooms I seem to be in these days.
I guess the only downside to the 5ks is the limited selection of finishes. Plus they are rather large as I recall.
I'm also finding myself getting frustrated with the 568 again - its DTS problems on my favourite BT DVD. I guess DSP isn't going to help that.
I just want a nice sound that isn't fatiguing - the B&Ws aren't delivering that now they are closer to me. I find myself enjoying the sound from my cheapo Yamaha active servo computer speakers more than my main hifi!