Since you are in Toronto, you should check out the Urbanite Touring bike, test rides don't cost anything, nor is there any pressure. Sure a touring bike is not a racing bike, but it's still a fun ride. You might be impressed.
Northern Ontario can be a little longer between stops than say running to quebec city where you would go past one great grocery store every few hours, if not 20. Plus up north you have normal camping requirements for stuff like minimal first aid, bugs. It's also a pretty terrible road. So my feeling is that while you will certainly make it on a racing bike, with decent wheels, you are not going to enjoy it as much as you would on a touring bike.