As long as it uses the same basic T25 flanges you can always change it for another T25 later on, oe better still, a GT25R.
As for the supra CT12, someone saying the CT12 is worse then a CT9, is not the case. The supra/soarer etc CT12's are completely different to the CT12 from the 3ETE days! Better off with a T25/ TD04 though as they are still not a particularly great turbo, and less parts available etc. At least the T25\ TD04's are pretty easy to get, and GT25 are cheap! Can get them for like £600 in rip off UK so how cheap must they be elsewhere!! Barely more then a butchered hybrid CT9!