thats more than one question jenkin
its hard to say, if u keep coilovers at 40/50mm then it will be tight! if u lower it to the floor it will get softer.
dont just do springs, general consensis is its not good for components
springs and matched dampers are good if u are on a budget/dont plan on going very low.
all been covered before mate. have a look through the previous posts about suspension.