Well, after reading comment after comment, I just placed my order for a EF 24-105 f/4 IS USM lens.
It is one of the new "white box" lenses separated from a Canon kit, comes with all the usual goodies including USA warranty card.
I've been shopping for several days and made the decision after finding one of the lowest prices that I've found and shipping was included.
This lens will fall somewhere in between my Canon EF-S 17-55mm f/2.8 and my EF 70-200mm f/4 IS USM that I use on my trusty old 40D.
The wife and I have two grammar school graduations to attend in June and a grandson birthday also in June so the new lens will get a work out!