Your situation is entirely dependent on your goals. If your goal is maximum possible power, best possible 400 meter (1/4 mile) times, and you're willing to deal with some lag (delay in power delivery), a turbo would be the best way for you to go. The cost can vary considerably, depending on the brand and whether you add things like an intercooler, stand alone management, turbo timer, etc. Going with a pre-packaged kit like Greddy or Edelbrock will give you better fitment, but will cost more than a "custom" turbo kit which you piece together yourself.
If you're like me, however, and your goal is more low to mid range power (for street driving), you have zero tolerance for lag, and you desire a relatively simple setup (no drilling/tapping oil pans, no turbo timers, no blow-off valves with their sound effects, no front mounted intercooler, etc.), a Roots-type supercharger (like JRSC) might be a better choice. I couldn't be happier with my choice. Here is my setup (00 Civic EX coupe 5 spd) and what I paid minus shipping (I got everything brand new):
Jackson Racing Supercharger, 6psi - $2349
Jackson Racing 190 L/h fuel pump - $89
Hondata S200 with programmed ECU and 440 mL injectors (deleted FMU and fuel enrichment relay, and installed OBDI IAT sensor in blower manifold per Hondata instructions) - $1305
OBDI IAT sensor (strongly recommended by Hondata) - $29
2 gaskets and several o-rings- $60
Total - approximately $4000
Yes it was expensive, but it was worth every penny to me. Everything else on the car (intake, exhaust, exh manifold, etc.) is 100% stock. I don't feel the need to go above 6 psi, and no I never dynoed or raced it. I installed the entire system by myself in my garage with a jack, 2 jackstands, and a large assortment of hand tools, including a 1.5 meter (5 foot) black iron pipe. No fabrication, drilling, tapping, etc, was required. After finishing the installation, I had to calibrate idle speed and ignition timing, zip tie a few hoses and wiring looms, and relocate the MAP sensor to read boost. The vehicle drives really well, with no detonation whatsoever (timing was left stock). Once again, this is no race car, but it's significantly faster than stock and actually has usable, instant torque! My number one goal was the preservation of the care-free Honda reliabilty and relatively low operating cost, not performance gains. Whichever path you choose, good luck
