You will be offered all sorts of weird and wonderful advice mate,
Best bet is to talk to whom ever is going to map your car, tell him what you want power wise, and he will advise you accordingly as to what supporting mods you will need, and how much its likely to cost.
This cuts out the "Ide do this..." and "No no, you need one of of these" advice that sometimes get a bit confusing on here.
Once you have been advised and you know what you want, here is a good place to look for the stuff and get advice on the best places to purchase.
Your mapper will also advise you about the boost you will need to run to get what you want, and the safest way to do it.
Every car is different, so even though you have the mods etc etc, the mapper will decide from what he sees before him on his laptop as he changes the fuelling and ignition advance, what boost he is happy to run to achieve your goal.
Most people are pleasantly surprised, some need to have issues with thier car looked at before they can go back and get the full monty.
Callum W