Currently I am using:
For drag street tire: Falken Azeni RT-615K
For autox street tire: Kuhmo Ecsta XS (read up on Andy Hollis testing these tires, so far on my hatch I agree with the grip preformance)
Last year I for autox I ran the Hoozier A4 (bought them used and they were awesome)
The previous year for autox I used the Hankook Z214 C50 (medium compound) and loved them and they lasted a full season with no issues
I was going to go with the Toyo R1R as that is now the popular tire choice for autox ST Class but they jacked the price way high. And in the test on Andy's car the Kuhmo beat the Toyo.
I wanted to go with anohter set of R Comps for the season but 3 cars needing tires does not allow the budget to provide for that.
I would have to say though the only cars I see competing on the Kuhmo V710 are those with a larger wheel base and a heavier car weight, i.e. Ford Mustang, Chevy Camaro, etc.
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if you can only race me in a straight line then whats the point 
...91 SMF SCCA
http://www.flickr.com/photos/8341770@N07/5601083432/http://www.flickr.com/photos/8341770@N07/5601083432/ by http://www.flickr.com/people/8341770@N07/, on Flickr
I see people out there spending money on the car to improve it … If you spend half that effort just working on your driving skills, making you and the car work together as a team, then you’ll go faster – period. To make the car go a second faster on the track takes a lot more energy and money than making yourself drive it one second faster.
– the late Tom Thrash SCCA Solo E Production