If you've done all your homework then boosting will only lower the life of the engine way down the road (hopefully after you'e gotten rid of the car). If you have good tuning and a strong fuel system, then day-to-day reliability will be fine.
Superchargers have more torque and are cheaper than turbos. I actually like superchargers, but the comapct scene seems to have this undying fascination with turbos. Turbos have more potential in them for 4-bangers. Both will start at about 2 grand and can run to about 5 thousand or so (American $$$). Two thousand involves a lot of DIY and junkyard engineering though and will be for a turbo, so you may not be comfortable with that setup. A supercharger will almost have to be a kit.
I should have mentioned this earlier, but new cams really won't have much of an effect on an engine without the proper intake and exhasut plumbing that can provide the air that the cams will flow. You can only suck so much soda through a straw right? Same thing with the engine.
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"I really like going fast. Just go off and meditate in the wind, you know? As corny as it sounds it works and feels good. It's a good way to just let the weight of the world off every once in a while...is this a big pose? I mean, yes this is a pose! I mean am I driving down the street to not get noticed in this thing? I mean rebellious is what this thing is I would say!!!" -James Hetfield
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