What guess work is there with a Trust turbo? Get off the bandwagon man, admittedly TD05 is a POS from what I've seen on a couple RB20, but you can hardly call it unproven seeing it has been bench tested by a tuner just as reputable as HKS.
EDIT: I should clear the above up. The evil and dark brand of turbos known as Trust should not be ruled out.
Perhaps consider the TD06 25G kit for the RB25. The pro style kit has every bolt, pipe, silicon line, washer etc you can think of. GTRS does not. But horses for courses. If you wanna chase 300rwkw a T67 could be swapped later onto a trust kit, or a larger rear housing onto the TD06 (although I think it comes with 12cm already)
Peace.