Well that is quite a jump in graphics performance. The 760M will perform worse than the two others, but it will still be really good graphics. I would personally go with the i7 at this point. The graphics are still excellent and to me having better CPU is more important.
However if you can, on Amazon try looking up the y510p. They will delieve in Mexico so I am amazed if they don't deliever in Canada. They should have a model around $1000 that is the i7 Haswell version of the y500p, it also has two 750m's so its the better choice.
The y500p like you are looking at does exist outside of Canada, it is last years version of the y510p. I am surprised you cannot find more information on it.