stage one is about right provided you swap in dump pipes and swap out 440cc injectors.
You can do that power level on stock injectors [or 225rwkw at 15psi] but need a good flow exhaust.
Your turbos will thank you with a long and happy life due to reduced back pressure and associated heat.
I am not guessing or using second hand info,I am quoting my setup.I believe you should have a bigger fuel pump right away also,Walbro is good.[for soarer dump pipes Lew of Marlew Engineering I think]
Stage 2,wow if you only get 20 or 30 rwkw for 2000 bucks worth of steel wheel hi flo ct12a's you wouldnt do it,surely? I would also like to know what these are capable of and how they would compare with nissan turbos like little GTR t28's which can do a combined 500hp at the flywheel [two] or t28's off an rb20.I dontb pretend to know a lot about these,quoting stuff s/hand here.[see "gtr t28" search for sale engines etc]
Stage 3 you would be looking for some control over ignition timing as well.
Should get plenty of replies,Cheers.Pete.