A little tree for a tiny Sydney yard

Hi Permies.  
I'm in an inner Sydney terrace, with a 30 sqm sun-facing yard, and want to replace a row of easy-going plumerias with two or three food forest trees, deciduous and preferably gorgeous (looking or smelling) trees along the north facing length.  This part of Sydney has quite sandy soil (though I'm trying to improve) and a coastal climate.  I'd love any ideas on what might work well. Garden and fruit tree websites seem rather... indiscriminate... in their praise.  There are likely to be periods when I need to water with bathwater.

Thanks in advance for your help.

A local nursery may have info or a Jackie French perme book may be useful as well.