You are going to be much better off tire wise if you can stick to the 17" rim, in both price and options.
A lot is going to depend on how much you want to do each event. I would say a good track/autocross tire is going to be something like a toyo ra1, or nitto 555R (road race, not drag 
). Kumho victoracers might be ok as well, but may chunk if not shaved for the track. If you are doing a full autocross season, you are going to have a hard time making any r comp last.
Best I can say as a general guide would be to stay away from the ‘slick’ style dot tires (hoosier, v710). They won’t last you long at all. The treaded r-comps should last a bit longer, but I would doubt you would get a season out of them doing both.
You might want to look into a good street tire, such as the advan neova, kumho ecsta mx, falken azenis, hankook z212(I think thats the one) .