well...this is how they rank the models
RS = racing series (base model, no sunroof, some dont come with AC)
LS = i believe it stands for limited sport, is one level above RS, which comes with sunroof, but no leather seats)
GS = grand sport, comes with everything, leather seats, sunroof, except for VTEC)
...well...for gsr and type r...ya'll know already...