All those are European or American brands - currently Aussie dollar is low. Plus postage will be high.
I did link March Audio, model P that is made in Western Australia:
About Us - March Audio
The P422, specifically, had great measurements, and is much more powerful than the Elektra amp:
Marchaudio P422 Stereo Power Amplifier Renewed Review | Audio Science Review (ASR) Forum
The Elektra amp does have great specs too, just not really that powerful, only 225 W into 4 ohms, that is about the same as the upper midrange AVRs of Denon, Marantz, Yamaha, Onkyo's.
It is probably a good choice, being made in Australia. It would be great if I can see some technical reviews that included bench test measurements, but I found none on the internet.
The March Audio amps (seems to be the only class D Bruno Putrzey designed amps build in Australia) is preferred mainly because it is class D, that I think is the trend, sooner or later they will displace class AB amps that are heavy, runs hot, and need more space, and for no good reasons now that highly transparent class D amps are widely available. Among class D amps, Bruno Putzey's design is one of the well proven one as he started the Hypex series long time ago and have been improving his designs over the years.
Bruno Putzeys: Head of the Class (D, That is) | Sound & Vision
I have replaced my two heavies amps in the last couple years and never look back.
Here's one of the huge amp I replaced most recently:
Obviously if space, heat, weight is not a benefit to your case then the only other advantage of class D amps is "green" lol... In that case, the Elektra looks really good, at least on paper, again, just not powerful enough imo, and no bench test results to confirm the advertised specs.
