Welcome to the forum and to an expensive hobby.
Nothing wrong with dreaming big and wanting to achieve those dreams. But sometimes it is better to listen to others and put those dreams aside.
Take a good read through this forum and you will soon realize that most members on here would advise you to stay away from a 600cc+ bike as your first bike.
We already established that the insurance in Ontario is a **** show. So lets set that aside and not take the cost of it into consideration.
As sexy as most 600cc+ bikes are, it is pretty much a waste of potential. Most if not all new riders will not posses the skills to ride that bike to its full potential. If you try to, you mill most likely hurt or kill yourself and/or someone else.
There is nothing wrong with a 300cc-500cc bike as a first bike. You would actually get a lot more respect from the community if you showed up on an R3 as supposed to R6. You would display wisdom and respect for the sport and the risk associated with it.
You are better off getting a 300cc bike and learning how to ride it properly and eventually beyond its capabilities. At which point you may find that a 600cc super sport isn't your thing and you end up with something completely different. i.e cruiser, ADV etc.
Now, I may be a little hypocritical; as my first bike was an R6. However, looking back at it now (16 year ago) that bike did not provide me anything different than a Ninja 250 would have. I would have probably enjoyed the Ninja much more than the R6.
Having said that, it's your money and your life.
Welcome and ride safe.