Depends on how cheap you are

And how fast you want to go.
IMO for the money you can't go wrong with a Kumho 712 ($105). I've used these on many cars. My M3 came with Yoko ES100s ($113) and I have to say that I'm pretty impressed with those too at that price point. The ES100s are a bit noisy though.
Looking through the Tirerack specs and ratings, the HTR-Z II at $89 looks to be about the best deal out there and matches the ES100 in ratings. I'd probably put those on my car if it needed new rubber, but I'm cheap.
The Kumho MX apparently has a lot of grip but you pay for it at $140. Not sure how these hold up to everyday driving either. Also the Avon Tech M500 seems to get good reviews and looks to be a good value at $115. Same for the BFGoodrich g-Force Sport which are cheap at $105.
Basically couldn't go wrong with any of those choices as long as you aren't looking for Azenis-level driving grip. They all are better than the Contis. I can say from personal and second-hand experience that the 712s and the ES100 will do fine on track as well.
_________________
Mike Whitney
whit32@gmail.com, 919-454-5445
V10, V8, V8t, I6, I6, V6, F4t, I4, I4, I4, I4, I2, 1, 1