Lowering w/ ETS?

[Killa B]

So I've been wanting to lower my 89 supra it has the factory ETS system fully functional, would it be worth the time and money to convert to coilovers? I know the look adds a lot to the appearance to stance that's one positive thing about it but does any one know how much difference this will give me compaired to the factory suspesion? I do a lot of driving in the mountains but this is also my DD so I just want lower the center of gravity a little to get a better hug in the curves and eliminate some body roll. I was thinking of dropping it about 1" in the front and 3/4" in the back I have subwoofers in the back so it already sits a little lower in the back. I don't want to do any of that tire tuck crap though it looks tacky to me. What brands are gonna have the best durability? I was looking at some K Sport Pro's on horsepowerfreaks.com are these decent?