a few questions What engine what harness has been used to wire it up if done yet
what sort of power are you hoping for
what is the car used for
how important are addition inputs and outputs for things like additional injectors, water meth, nos, boost control, idle control and such
what sort of budget do you have haltec are great, so are motec, and autronic, adaptronic is pretty awesome to yet lacks some of the features of the higher end ecus, yet is cheaper, nistune works pretty good to if you have the ecu already. id avoid microtech imo, rubbish, and they hate the factory nissan cas.