For the money I'd say strut bars. The definatley stiffen the car up, and the stock sawy bar is pretty good. If you wanted you could just change the bushings on the sway bar and probably still do the strut bars for cheaper than a good sway bar.
Front strut will do almost nothing, rear strut will stiffen the rear slightly, rear sway bar will make a tremendous difference in the handling of the car. Our rear sway bar is tiny, if you upgrade to the Addco 22mm bar the cars handling will transform to near neutral to slight oversteer instead of tyhe standard understeer on all passenger cars. It takes some getting used to having your back end break loose first in a corner but once you are used to it you can really fly through the turns and let the car help you. After that adjustable struts are very good for fine tuning the suspension.
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