"Best" is a loosely definated term. The best for one person doesn't necessarily mean the best for the next guy. But it kinda sound like you know what you want. Something with a good balance between a street application and occasional track?
Everyone can throw in there own personal opinion, but for me, I would have to say the Tein Flex system is my answer. I wanted something with a good range of adjustability and something for a reliable company. The only bad side is that TEIN is kind of on the expensive side. Some people will argue it's not worth the money. But hey, to me, I've had it on three cars now. One of them was tracked every month for about a year. And I had absolutely no problems with it.