In truth, I tend to shoot 100-200 most, 40-80 next then evrything below that. I do use my 18-55 IS but <28mm is pretty much only for my Hudson River shots.
That said, the ability to get the Hudson Highlands wide with an L lens is really tempting. I may have to at least rent one.
Meantime, I'm gonna tape my 18-55 at 24mm this weekend and seehow it feels.