what would the best choice for suspension for sc 400?regular driving ...sometimes more sporty but 80 percent normal driving.

 

BC Racing or D2 Racing make a great and extremely popular coilover. They are great for daily drivers who have the occasional fun drive or mild track.

 

If you are not looking to adjust ride height, I would suggest a spring/shock upgrade. If you want some height adjustability, the TEIN coilover model that uses the factory top hat would probably be a good choice for a daily setup.

 

I agree with this. Easy set up, relatively inexpensive, gives you what you are looking for.