If everything is original I would get the big kit and change it all if you change upper ball joints now next week you'll be doing lowers then strut rod bushings and swaybar endlinks and on and on the cost is about 700-800 for the kit but then you got everything brand new and don't have to worry about it for quite a while again and its not hard to do just basic hand tools are required and a spring compressor these can be borrowed or rented at the local parts store and it can be done in a day