I'm going to disagree just becuase of this "Western Australia". How common are Beselers or Omegas down there? How about parts?

My suggestion take advantage of what falls into your lap. In todays world quite a bit of high quality stuff from all makes is being dumped.

Devere,Omega,Durst,Beseler are all good. Some are better. Some are worst. But a used one in good condition with all the parts will be better then one that's not in great condition or that you can't find parts. If somebody offers you a 5x7 enlarger and you've got the room take it. OTOH if somebody offers you a nice complete MF enlarger grab that.