My issue is that I am mostly abroad.

Just as you can slap on long distance super saver on your voice plan with Rogers, you can do similar with T-mobile and the blackberry plan in US, which basically gives unlimited data roaming. (I have clients who do this).

Basically I'm trying to find out if that is what I can do.

Or just go on the cheapest available plan with rogers and BB and cough up according to the data transferred.

/E