in my experiences w/ boosting hondas
don't buy a used kit and don't try to piece something together

as far as a used kit, it's just not worth it. A friend of mine purchased a used kit, but ended up spending so much in little things to get it working he ended up shelling out about the same price as the new kit.

a pieced together kit may also seem to be a cheaper and faster alternative but you will probably end up with fitment issues(which i have seen happen) and one thing getting in the way of something else. When you buy a complete turbo-kit everything is fit tested and produced to work with one another. It may be a little more expensive just to buy a complete and new kit, but you will save alot of hassles and money down the road.