Skip the bpv, boost control, intake.. waste of money at your power level. read up on the cobb tunes. Not really needing a protune.
Then search the forums as all the STi crap with bolt onto a WRX for those years.
Just bolt on a vf39 and call it a day. No need to add issues with a fmic unless you go much bigger in the turbo dept.
The car will be perfect with a vf39. Anything else and you will need to build up the gearbox.