A belated thanks to all,
I ended up buying the front seperate unit and the third unit which was in slightly (and I say slightly) better bath and kitchen. The third unit was being vacated right around settlement (which included access prior and a chance to repaint and recarpet loosing only a few days rent) and increased weekly income by $10pw.
Thanks again for all your help, unit one was always my gut feel but I suppose I needed some validation.
jx
