After doing lots of research, I have come up with a solution:
You can sign up for T-Mobile with blackberry only data + $19.99 unlimited int'l blackberry, giving you unlimited data and email while overseas (or in Canada!) You roam on Rogers and Fido flawlessly, and you have UNLIMITED data, not "unlimited" like rogers has...
I am a T-Mobile dealer myself, and am giving BBforums users $50 off a bb 8700g via a credit on their account and waiving the $35 activation fee.
Shoot me a PM, and ill set you up!
my screenname is The Mac Ace on howardforums, so you can see my flawless feedback there