Example 1
Example 2
(I haven't stretched the top right in Ex 2 so the top isn't aligned, but it shows more or less what the 2 column option looks like.)
I don't much like the unstretched centre-justified design, because it wastes a lot of space.
But that's more a problem with the narrow dKos version than with a centre justified design in general.
Centre justification otherwise is fine. It's where your eyes naturally spend most of their time when you're looking at a monitor, which is another reason I think it makes sense to put the bulk of the information there.