I run a custom kit with Boostdesigns intercooler kit. It's not really a good kit and you probably can't do much research on them since they died out on a bad note.
Personally, I believe you shouldn't go with the Greddy kit. I think you should get the JGS kit from
http://jgsturbo.com/index2.html . I like this manifold because it's cheap, durable, and you can make the turbo flange where you choose so it will clear your brake master cylinder. There will be more things you need but just ask what your confused about. If you have good money to spend, check out Grounzero's manifold or Turbo240.