goujon

i want to replace the suspension on my 97 turbo 2000, i think it as standard shocks with lowering springs so is nice and low but to soft on the rear so with weight in the back tyres rub on arches so i was thinking sti suspension or coilovers... just want to know what ride height and how stiff sti suspension is on a classic is it just like standard suspension set up? or shall i just go for coilovers...?