[SuperFlea]

it's not that bad. You can use the Springs with out any thing else. Although it would be a good idea to get the dampers, since they are desighned to work together. The Sways are aptional, Unless you drive like if you were in auto-x every day, you don't really need them.

Edit----> Since you have an SVT, your sways are much better than a reg Focus I think you'll be ok!