1jzgte Toyota 2.5L straight six turbo

Dont bother with the 4agze unless you are going to turbocharge it. Personally I would choose a turbo over a supercharger for the reasons you describe, at least you can drive the turbo off boost, a supercharger will be boosting all the time and if its clutched it will kick in just as hard as a turbo would. Power would be easier to handle though because there would be less of it, and it would cost a lot more.