just from what i have seen superchargers dont give as much gain as a turbo does...especially when it comes time to up the boost. turbo install is a bit more indepth but still fairly tame. personally i would go turbo before i went supercharged. as for what motor to go with if youy are ona budget get a ls, they are strong and like moderate boost levels and if it blows up you can get another for pretty cheap. i have a turbo gsr civic hatch and i love it. this is my 4th turbo car and i will never have anything else....unless i get a supercharged v8! just do some research and find waht is best for you. if you autocross you may not want the turbo as it has to spool and in auto cross you may not want to wait for the turbo to spool. the super charger will give you nearly instant power. if you truly must go with a super charger might i suggest the procharger kit..i would totally rockl one of those.
get out on the net hit some forums and just make sure you learn as much as you can. then YOU decide what you want. dont ever let your freind talk you into what you are spending your money on.