Easy there killer, I wasnt saying it wouldnt be stupid to go that route and by no means that they are as good as mediocre coilovers. Sure, the insert style, if done right, would excel in every aspect over mediocre coils. Although, you know as well as I do, most people aren't willing to spend the dough and/or will never use that coilover for what it was designed for, especially TR and the majority of 240sx owners. Are you going to use said style to it's full potential other than lowering the car and putting around TPA? I highly doubt it.

In short, the insert/ground control route would be the best bang for your buck.