Im running Deatchwerks 650cc injectors on my VF43'd WRX. They work fine and have a little more room for a larger turbo in the future.
You might want to spring for the more expensive STi Pink 565's because they are known for providing factory-smooth fuel delivery for a very nice idle. My injectors seem to be slightly uneven in spray pattern or something because the idle is kinda lumpy when the car is cold, but this may just be my tune needing to be smoothed out.