Heard some good reviews about Masterpower Turbos aswell, very popular in the US, especially with the Turbo Mustang crowd. However they are only available in external gate.
Here is the Australian distributor
http://www.expressparts.com.au/master_power.asp
Just over $900 for a brand new turbo that has the same power producing capability as GT35/40.
They are made in Brazil
Cheers