The six will be legal depending on the total capacity allowed by the rta in your state.
An rb20det would be legal i think, you would have to check on a 2.5 litre turbo 6.
A turbo will allow a lot more scope for power increase over a super charger and you will have to make up the whole setup for the super charger, while the turbo set up comes as factory.
With the extra weight(?) of the wagon you may get away with the 1jz but the rb should be nearly as good. The 1jz makes an awesome sound and no one will know what hit them when you smash them at the lights or even on the freeway.
And if you are concerned about the power delivery, you could bleed off most of the boost until you really want to show someone who's the boss