Pay to get it tuned. Don't throw your money away by not tuning it. Bring it to a reputable shop and pay the money to have it done right. Don't buy any of that shitastic Ebay performance chip stuff, or use a tune that worked on your buddies car.
As for which kit/turbo, piece one together. There are thousands of threads all over the internet regarding types of turbos and which ones are better for different things. Research what you want to do with the car and your ultimate power goals, and then piece together your own turbo setup from there. Then get it tuned.
Did I mention that you should get it tuned? Just figured I would let you know that a tune was the most important part of any build.
Tune it.