I'm running the Tein Flex and they have been great on the street as well as the track. A nice used set could be nice. Why dont you look in the classified section?
The only thing I have against springs is that you can never seem to get the drop to the perfect height like you can with coils. Just my 2cents
Jade86 has posted up a set and is in Cali as well. Seems like legit?
http://www.ft86club.com/forums/showthread.php?t=19941