Patrick,
There is a lot of write ups in the Forced Induction section on the main SAU forums.
It all comes down to money at the end of the day.
Lay out a plan of what you will want to use the car for.
Work out what parts will be required to achieve the above mission and then go from there,
Hopefully that can steer you in a direction in regards to budget.
There are a few super tough GTR's kicking around Perth.
So I am sure you will get a ton of good advice.
Also research who you will build with.
Mike