A properly set up supercharger will cost more than what your car is worth. If you purchase a used kit, you're only adding risk to your pocket, and the software tune will cost you upwards of $800 at minimum.
The 325 is not a good platform to get power out of at all. If you had a 330, I would be more open minded. If you absolutely must look further into this, the only two supercharger kits I would recommend are by Active Autowerke and ESS Tuning (twin-scroll).
There are no commercially available turbo kits that I know of, other than Technique Tuning. Even on their website, the tunes and advertised kits are for 330's and above. You're venturing into custom work with a turbo.