Turbos = pure sex
My best time with a stock engine, the Greddy 18G turbo, ACT HDSS clutch, and tuned Uberdata (231whp, 181 torque, mustang dyno) was a 13.5 @ 103mph. The greddy is a nice kit. I'm glad I went with it for my first turbo kit, but will def go much bigger next time. And there is no way he is giving you "everything you need." You still need a heavy duty clutch to handle the extra power, you'll need to tap your oil pan for the oil return line, gauges, fuel pump, and other small things. When all was said and done on turboing my integra last summer, the cost was $4k. I would do it all over in a heart beat too
Just make sure you do your research before you buy. Turbos are a lot of fun, but just make sure you "do it right the first time."