keep in mind that mopar ran the same basic stock suspension in NASCAR and TRANS AM

Do you really need something different on the street from what Richard Petty had on the track?
you can tweak out the stock suspension and still get great results...firm feel is one kit that comes to mind, basically beefier or tubular everything and prices are great.

i am not trying to knock the other options or talk you out of them, but keep in mind the stock suspension is really good.