As has been said, STI ecu is the way to go. Mine has a 3" hks tbe and although I have yet to "drive" it, when I got it started for the first time in over 2 years it started easy and idled smooth.
As for the bov, it's a personal preferance. Mine has an atmo bov and I will be removing it. My last car had one on the motor when I put it in and other than making noise, all it did was make me use a bunch more fuel.