I would agree the 30D is a superb camera and the lens is a great choice with IS... I would also question the important point about the investment you have made in the Olympus system..  If you have handled the Canon and it fits the bill, and you need a 2nd camera you will be able to use the Oly so it makes sense that way..  Another possibility would be the L glass 24-105 this  is quite a lot better if you can afford it..

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt