I want something not too soft as the original one but not too stiff since this will be a daily driving.
Any suggestion?

 

go with Tein....

 

I had Tein Flex Coils and they were awsome. I had an EDFC that allowed me to play with it a little. Frankly once I was set I didn't use it as much. I would just put up with getting it to the settings you want and leaving it there. Sounds like youll go just a little stiffer than stock. You can probably get away with super streets as thats only ride height adjustments