I personally and running 680's and if it were not for alcohol injection I would be running out of injector. That is running 25 psi on 93 octane with the alcohol injection on a GT35R. Before the alcohol injection I was almost maxing out the injectors to maintain 11.5:1 at 23 psi of boost. If you are planning on having Al tune the car with a dynoflash my view is that he is the best man to ask about what injectors to run. He will know a lot better than any of us what he can get a good idle and good gas milage with 
Keith
Keith