I have the Hahn Stage 2/2X kit set for Stage 2 (approx 7 lbs boost and around 240 HP or so). Although Hahn can sometimes be a little slow in response to orders and queries, I am still happy with my purchase.
Are you planning on the Hahn Stage 2/2X? Hahn also offers a Stage 1 kit (no intercooler and around 4 lbs of boost) that can later be upgraded to the Stage 2/2X at a slightly higher overall cost, but the Stage 1 kit does allow you to get started at a lower cost. I bought my Stage 2/2X kit as a "Slightly Warm" special which included a FREE used StreetRace exhaust. The FullRace exhaust is cheapest ($400) but may be too loud for daily on-street use. The StreetRace exhaust ($600) is still loud, but can be equipped with baffles ($100) to reduce the sound some. The Dual Side exit exhaust ($900) is probably the quietest and can also accept the optional baffles for an even quieter sound. Of course, you can also use a Welter exhaust instead at a higher overall cost depending on which Welter exhaust you pick. Hahn allows you to buy a simple turbo kit w/o fancy appearance upgrades at a relatively affordable cost or you can pile on the upgrades.
A supercharger is probably the safer boost option, but costs more. Turbos generally cost less and can provide more boost at lower RPMs, but do carry a higher risk of problems if something goes wrong. Boost and AFR gauges or a combined Boost/AFR gauge are generally considered essential to monitor a turbo, and are recommend for a SC, but not as necessary since SCs produce the same boost at the same engine RPMs unlike turbos.