I would not mount the A6 on the 19" wheels, put street tires on them and keep your 17" wheels for your track tires. The cheapest 19" A6 on tirerack was $308 and it was a narrow 235 width. If money is a consideration you might be better off going with the Nitto NT01, it will last a lot longer than the A6. Even the R6 will last considerably longer than the A6. If you are going to be sticking with autocross, you should probably get something like EBC yellow stuff, Hawk HP+ or at least HPS pads. If you are going to do real track days you will need something like the Hawk HT-10 with brake ducting. For the suspension, you might want something like the Roush Trak Pak or Konis. Some sway bars and control arms would be a good idea as well. Do a lot of research before you buy anything.