If you have the space, I think line arrays are the way to go. Each doubling of driver count increases efficiency by 3db, plus the SPL drops off at 3db per doubling distance instead of 6db. So the drivers are working a LOT less to create the same SPL at the listening position, resulting in less distortion and better dynamics.
You're obviously paying for a lot more drivers, but in most speakers the enclosure is a large percentage of the cost.
Some people complain that line arrays create an unrealistically large image, but I really haven't found that to be the case. I listen to a lot of "intimate" music (such as solo singer and guitar), and have found the image size to be fairly natural sounding.