I was a Oly user who made the switch to Canon and let me tell you while I am very happy with my 30D and Mark3 it was a huge investment and you wont come even close to recovering half of what you spent on the Oly system. The E3 is a solid camera I had a chance to shoot with one about  2 weeks ago and let me say that Live view is very overated in most cases but not with the E3's flip out screen it made getting some insane angle's on a old mission church possible.  I would stick with the olympus system.