whether you go with a standalone boost controller depends on what management you decide to go with though, as some are capable of closed loop boost control (the best way imo as then the ecu has total control of everything).
some other ecu's have so called 'mappable boost' but all that does is try to control the boost valve to a certain opening that should give a certain boost. they don't take account of differing conditions, weakening actuator springs, leaks etc, etc, and could end up causing too much boost depending on if they operate a bleed on or bleed off boost control strategy.
i haven't used a standalone boost controller, but have heard that the turbosmart boost controller is good. beware of ones that use the bleed on control method that if they lose power or develop a fault can give too high boost.
certainly do keep us updated, it's definitely an interesting project.
