Beth, check out the "Which Springs" post that's posted by Immortality.
Adjustables: you can adjust the stiffness of the shock/strut.
Non-adjustables: self explanitory
www.tokico.com/ www.koni.com/
If you are not doing a bunch of road racing then the non-adjustables will work fine. I would go with the non-adjustable Tokicos if it were me. Those would be the ones that TruBlu01 posted the price for. Tokico also sells a spring/shocks/struts package as well.
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1994 Red SVT Lightning #2019