what do all these mean??? why does cadillac go through this confusing way of naming thier cars? Are tehy just model numbers? Can anyone tell me what the 1SA model is and so on thorugh the whole lineup. and which sts would be the fully loaded (v-8, 18 inch wheels, nav, HUD, ALL THE OPTIONS) version? I have yet to see a new STS with navigation, ive seen roughly 15 STSs are various dealer lots, NONE with navigation. What gives? wouldnt they want thier best and brightest version of the new car out there first? As well as the other versions?