Kumho xs is another good dual purpose selection.

onlinetires.com actually has a sale right now for toyo r888s which arent bad for basically half off.

The Continental Challenge take offs are not a good tire for autox in my opinion, they take a good amount of heat before they start giving you any type of useable level of grip. They are made by Hoosier and a harder version of the R6.

Im not big on autox, if you want to road race it will help you intially but requires a much different type of driving. I would say its not a bad place to test and tune to a point but it really comes down to what your desire is.

I finished my build and needed to test and tune, I went to Sebring with NASA and dropped $300 for the day and had engine problems that ended my day after 1 session. This type of thing happens in road racing especially at a track like Sebring. I still was able to get data I needed for my next event at Roebling road which was very sucessful partly from the things discovered at Sebring. I have had other track days ended early as well and its just par for the course, you cant let the possibility of failure and losing a couple hundred dollars keep you from getting out there.

Road racing will expose any weakness you or your car may have.