Turbos are vastly more efficient on motors than superchargers. I use to build custom setups for VW's and they were always more costly than a turbocharger setup.
Plus you already have a turbo on your Saab unless you swapped in an older N/A motor.
SaabCentral forum the most comprehensive Saab resource on the internet. Join our discussions on the Saab 9-3, Saab 9-5, Saab 900, Saab 9000 and all other Saab models, choose your forum.