I guess when you look at who is up front now and whom is available:
From an NZ point of view, Brockie and Boyd are up top already whom are AWs (or fringe) and not really 'strikers'. Kosta is much the same and settled in Melbourne, Wood is not coming back and Smeltz signed in Sydney and his missus has him under the thumb. The only Kiwi striker options that would potentially have an impact would be Kris Bright whom I really do not rate or everyones favourite god botherer Rory Fallon. Those are probably the only realistic striker options that would be worth signing. You can sign Hamish Watson, but is he going to be an upgrade on whats there or score the goals that are not being scored right now? When you think about the level he is at, he is the not the player you sign to solve the problem, he just fills a squad place. When you look at Rory and Kris, and evaluate those options for what they are, then there really is not a Kiwi option.
It would need to be an Australian.