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if you want the roots/twin screw type, get the KB. if you want the cheaper route, get a vortech or procharger, those are the best centrifugal superchargers.
saleen's series I and II are made by eaton (both roots) -the series 2 is the eaton M190 i believe. saleen's series IV (twin screw) is made by whipple -its a 1.6 or a 1.7, very similar to the KB 1.7 because they use they the same internals.
Im actually going to upgrade my series II to a series IV this xmas so ill let you all know how that goes, what kind of power i see atc.