Snowy River wattle will need to have the spent flowers removed each year otherwise it will get tall and leggy. I think it will sucker up from the base but still needs a bit of work.
A. vestita gets wide and will need an occasional prune and weeps so might form a trunk if you don't keep it bushy. I don't think it will resprout from old wood. Nice shrub though as is A. boormannii.

A. fimbriata is fast-growing, very dense right down to the ground, and makes a fine display of blossom. Its height is usually in the 3 to 5 m range. Not so interesting in foliage as species like A. vestita or A. cultriformis, but larger an more vigorous.

Hi Have a look at the Link below it may help you with your choice.
Good Luck with your new garden..Cheers...MM

Here is a link that might be useful: Flora for Fauna

I'm not far from you, at Gosford, and planted an Acacia Longifolia a few months ago.
Let me tell you, it's very fast growing.
Why not try a few of those a metre or 2 apart.

Good luck
Roy

I like the zig zag wattle (macradenia) - may be worth investigating for your area. Will grow into a reasonable sized tree in one season. Weeping in habit. Can get borer and as with most wattles, can be short lived - plant them by all means but don't rely on them to be there forever. One of mine fell down. Another has lost a couple of branches on very windy days, so is now a 1/2 wattle. Fantastic display - flowers are large and smell luverly!

Yes, I love Acacia macradenia too. I bought mine from Mt Annan Botanic Garden when theirs was in flower. SPECTACULAR! Lovely smothers in bloom and as mentioned, wonderful fragrance.
I had an acacia longifolia and agree it grows like a rocket. Mine was VERY short lived though. Full size and dead within about 5 years. Cost a fair bit to have removed.
Another nice fragrant one is acacia podalyrifolia, very grey in effect, and acacia baileyana is always reliable, but I think both podalyrifolia and baileyana have been mentioned as prone to becoming a weed.
Perhaps you could consider trying acacia pycnantha. Spectacular when doing well. It might suit your area, and it is the national floral emblem so that's a bonus!

Okay, so now I want to grow ALL OF THEM! Thanks for all your suggestions. I have some digging to do now!

zig zag wattle is prickly if that concerns you.