jgold

Thanks for the very comprehensive reply to the points raised. It is very useful to have actual experiences and situations to validate the options possible. Your effort in relating your experiences to date is very informative.
My only point of disagreement is with the ease of having a Canadian travel agent "take over" the booking. I have done exactly that (book in US through RTW desk and ticket by a Canadian travel agent) with absolutely no problem. Perhaps the agent may have technically canceled and rebooked, but all that was transparent to me. I received exactly what I had booked. Perhaps it was something unique to your situation that prompted the suggestion of difficulty.
Do I take it that your final decision is to purchase the ticket in Canada?, hence the visit to niagra Falls?
Could you update us as to how this works out, in terms of ease, time, etc. May be a good moneysaver.
Sounds like a wonderful trip. Really like the idea of seeing the world's great falls in one journey.
Regards
Rens