You want #1 from a pleasing to the eye stand point... look at the side view of these cars.. 1.5 leaves the rim and tire perfectly concentric with the wheel opening and a small gap between the fender and tire, very pleasing to the eye. Go too low and suddenly you have the same look as when it sits too high when stock, the wheel opening and the rim are off and it looks weird.. it's a design thing. Like why an Aston Martin looks beautiful to everyone.... If you go too low you'll hate it and eventually sell it for a riced out miata.. then start drinking because you think everyone on the road is laughing at you (they are) and you'll start wearing you hat with the bill to the side to block out some of the people.. which will lead to the general flattening of the bill on your cap and you will have to purchase those giant white rim sunglasses because you can't use a baseball cap any more to block the sun... and let's face it once you are here... your life is over....