I would go with either sachs, bilstein, or koni. I know you said you're keeping stock springs but im running koni coilovers and so are almost everybody that is into the track from either ground control or tckline. I also know alot of people running bilsteins too, but be careful when you buy them because you can replace the insert but requires some cutting and grinding and in my personal opinion isnt worth the extra money for the ease of replacement of the entire strut. If your looking for an OEM replacement than go with Sachs or Bilstein HDs, if you want something sportier there is a whole world out there and you will need to look around.