has anybody used any of the above on a my 06 sti . if so what are youre thoughts.

I've got Ohlins on an 03 WRX if that's a help, I think they're worth more than the car to be honest. It is obviously a huge step up from the OEM or Eibach kits that were on there before. Best person to ask is DAvid at API as he has driven my car and knows more about suspension than I will ever do.