For a VF you do NOT need new injectors! How many times do myself and others have to repeat this fact for the '06+ WRX's? They have 565cc injectors which is more than sufficient for your power goals. You don't need a new fuel pump, either.
You will never get a better bang for your buck than finding a VF39 and, preferably, a used STi intercooler/splitter (and of course a retune). You'll be very impressed by the results.