Lower isn’t necessarily better handling, the lower the centre of grivity of car the better in general, however the suspension geometry means that if the lower arms are beyond horizontal then loading up the suspension further on cornering will alter the geometry away from the ideal so lower isn’t always better. Besides, if you have a T or an L series engine up front then their low sump and oil filters get removed by speedbumps if you go too low and shedding all your oil whilst driving isn’t a clever thing to do both for traction and engine life!
Harder isn’t always better in terms of suspension either. Yes race cars have hard suspension, however racetracks have considerably smoother surfaces than we usually drive on. Ok so you say you are willing to put up with a poor ride quality on the road, so you want harder suspension yes? Well no not always, it depends on the road surface. Softer suspension will grip better on rough bumpy surfaces, as hard suspension will mean the wheel/tyre unloading/leaving the surface over every bump. Ok, so we want soft suspension then? Again no, it isn’t that simple. Soft suspension will grip better over the bumps and tends to “skitter” a lot less on rough surfaces however you’ll get more body roll and weight transfer on cornering which upsets changing directions quickly. Confused? Yes? Well like many things the choice is a compromise to suit the road surface that you’ll be driving on. If it is souly a trackday car then you can go low and hard, if you live where there are rough roads then you may want to stick with the standard setup.
What I’m trying to say is not to confuse looks and responsiveness with good handling and be realistic about what you want the car for.