What I would yet personally suggest is stronger actuator for the turbo itself, as the original one is a bit weak and doesn't hold boost good enough in higher rpm's, however turbo itself seems to be able to blow a bit more.
As an owner of gc8 with vf37 I have to say it's pretty impressive, at least for myself - especially with short gearing.
If you can find cheap conversion set, as it happens sometimes - I'd say: go for it.