If you are just starting out i think it would be best to with the basics first;
-synthetic oils with additives
-ignition, wires and plugs
you CANNOT go wrong with these, it will only increase your engine efficiency when tuned properly, if you still do not have what you desire then look into the bigger upgrades.
superchargers etc are expensive and require certain maintenance to run well for a long time that most people have no idea about.
If you just starting out go cheap and learn that way, besides i'm sure everything i've mentioned above is still cheaper than a supercharger!!!!
these options(depending on how your comp is tuned) you will even increase your fuel mileage!
If you are unsure about this stuff just stop by a partsource or performance shop and speak to a person with experience and i dont mean the kid with glasses and pimples who runs daddy's vet on the weekend, it seems to be happening more and more...