The BFG Gforce Sports were the longest lasting of any performance tire I've abused on my Miata. Although I love Falken, the last 2 sets I've had have worn out extreamely fast! The first set of Falken 512's I has lasted around 20k miles, the replacement set lastet 11k miles!
Considering how much I drive my Miata and travel in it and all the rain we get, I'm leaning towards trying out the new BFG G force super sport. What little reviews I've read say they are as good as the Sports for dry yet have excellent wet and even light snow traction.
I've also read a lot of good things about the new Falken 912's, but then again I'm starting to loose my love for them. I currently have their 329 tire on and they are almost down to 3/32's after just 9k miles! And these are 60k mile rated!