Blas, how do like the DS-90s some 7 months later? What happened to to your 20/20s? My buddy who bought your Cool Edit now has two of mine hostage!
Anyway, I can't seem to find anything with more than 2 out channels on it. I found stuff like the "M-Audio Pro-Fire Lightbridge"
The only advantage (and maybe a good one for some) to is by NOT using an amplifier to distribute the power. With these being powered monitors, they would be an advantage for travel and simplifying studio wiring.
As mentioned, the lines would have to be pretty long before the digital would show advantages with noise reduction.