Looking at the canada rules it looks like your basic rules are the same with the addition of that strange (to me) preperation point schedule (nothing like that in the US)
In the US the two main classes for the contour to run is GS or STS (a street tire class)
For street tire classes most people run either the Falken Azenis RT-215 or the Kumho MX (my preference) Falken is also coming out with a "better" Azenis RT-615 early this year so if you are able to wait you might want to look at that for a street AutoX tires
I did not see anything in the canada rules I was reading about a street tire type of class.
For longer lasting R compound tires I have heard good things about the RA-1 and the Victoracers. In the spring I hope to go with the V710's if they come out with the right size for my miata(should be here anytime now). but if you go for R compound tires you will most likely need to have a second set of rims for AutoX depending on how much other driving you do.
For either of the Standard AutoX "Street tires" you will find your size choices very limited I ran the 205/55/16 MX's but it might be better to run the 215/45/16 in the falken's but if it gets at all hot where you AutoX be prepared to spray down the falken RT-215's with water between runs. The RT-615's are said to be better but that are not out and running yet so I dont know if this is true or not. I also am not sure what sizes are coming out with the RT-615.
If you already have or can pick up cheap a different set of wheels/tires for either your normal street driving or your AutoX driving I would get some sort of R compound tires and swap them on for the weekend or at the event.
