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you can get a used supercharger setup for a fairly cheap price around the forums. It wont need to be custom, and i think would be a lot simpler. But, if you have the resources, turbo would be pretty nice. But, it will be quite a bit more expensive.
Superchargers are cheaper, more responsive, easier to tune, easier to install, car runs cooler, easier to service. Just a few of the Plus's. Turbo's make more power pound for pound. Simple as that.
good setup for a 5.0 is a single turbo and a good kit that will last will run around 3-5K depending on who makes it and what kind of boost you wanna make...