You are correct, for some reason I remembered the international version being a tad smaller than that... So yeah, you should probably go with the international version as long as you get as good service with whoever you have to go with for that phone.
The Galaxy SII international version is on VirginMobile (They run off Bell's towers (who teamed up with Telus and share towers)). The Galaxy SIIX is from Koodo (which is Telus's budget carrier). Only wanting to pay for a cheapo talk/txt plan, and can think about data later on, maybe get some data in a retention deal.
Looking at VirginMobile's coverage map... well, the whole lower-mainland (Vancouver, BC, Canada) is covered.
Yes, even though the SIIX is clocked faster, the SII has a better, faster processor, not a gigantic difference, but there is a difference.
I don't have an answer for you about the International version still being manufactured... I would guess so, it's still a popular phone even though it's technically already outdated, but I don't know for sure....
I think the S2 international version is still more than capable enough. It has better hardware than some of their phones released after it did(Ace, Ace 2, etc), so if they're able to run the newer androids, the S2 with a Dual core processor (rather than the Ace's single 800mhz, and Ace2's 800mhz dual core), the ram is good (1gb, just like the International S3).
I know someone with a Galaxy S 1 with ICS (most likely a custom rom of some sort), and he says it still runs smooth.
Thinking the S2i should still be future proof for 2yrs? that would be good as then splurge on the Galaxy S 5. (off topic: they better get new battery tech by then).
EDIT: Just did some more searching about VirginMobile, turns out they have the worst customer service possible where they deflect all your calls since they now have Bell's crap CS because they were bought out by Bell. Maybe i'll just buy the phone, and stay with Fido, and get a good retention deal with them since my contract is ending in a week. Fido's CS is really good.
Could you give the best tips on how to go about moving the (most likely locked to VirginMobile) phone to Fido? i think the law is that carriers are required to allow switching of carriers, but they dont tell you the code?
This sucks!
EDIT2: Getting Galaxy S3 on telus, rest of my family is with them, so i'll get a good plan.