Here you want to be out of the box... You want low end tq... You want to have nice power... I say fuck the norm and do a RB30DETT.. Or even DET... It has been proven to 300+hp using all stock nissan parts. It may be a little more expensive and parts are hella hard to source, but hell you got to pay to play... And I dont think any of the afore mentioned motors can stack up to the rb30et in stock form.

I have a full write up on the RB30DETT if you feel like looking into it.