Which network provider to choose for iPhone 5 in Canada?

I want to buy and iPhone 5 and i just don't know what options to choose, i leave in Toronto btw
1st: i wanna know if it's better to get it unlocked or with a 3 year contract, cause i might be on some vacation in uncoming years. To some countries that i'm sure these network providers are not gonna be working there.
2nd: what network provider to choose, there are Rogers, Bell, Telus etc.i'm gonna need highspeed network and some international talk+text, which network do you recommend.

1. You better buy a unlocked IPhone 5
2.http://www.techvibes.com/blog/which-canadian-wireless-carrier-is-best-jd-power-knows-hint-its-none-of-the-big-three-2011-05-10

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