Toyota Altezza 2001 model
1Jzgte non-vvti single turbo swap
was running a greddy ultimate piggy back
want to go standalone now

 

did some reading Haltech 750 elite looks pretty good

 

Pick a tuner.

Ask him what he likes.

End of story.

The hardware and software is meaningless without someone competent in how to use it.
In my opinion? AEM v2 is the BEST! Although, I've never tuned any other true standalone so that's why I'm biased