Hey Steve,
You may find some of that comes in the supercharge kit (assuming your going with Raptor).
You can find the kit info here: http://www.raptorsc.com.au/subaru5.html
Fuel pump isn't mentioned on that list, but Tim from raptor helped organise one when I went through my order.
The install with the whole kit is pretty straight forward, so I wouldn't worry too much about trying to get some stuff done ahead of time. Plus, it can reduce the amount of tuning needed if you do it all at once (tune for larger injectors & SC at the same time, instead of needed constant re-tunes as you upgrade your parts over time).
I'd recommend just making sure other parts are working properly. During my install, I had to swap out my AVCS solenoids, upgrade the factory clutch and exhaust. I'd recommend focusing on this stuff over injectors/fuel pump.