one tip with grevillea, as a rule they dont like wet feet or heavy soils, i am in clay and mine are doing fine, but i have made sure they are raised above the surround soil and that their is a good 2 ft of compost/sand under them.
a grevillea worth chasing is grevillea yamba sunshine, also look for gin gin gems - grevillea obtusafolia, they are good shelters for birds and against wind. also dont forget to plant a coconut ice, similar in size looks etc to a robyn gordon but a lighter colour flower.
verticordias are normally found coastal but i am finding verticordia grandis, grown from a tuber is doing great, in fact is the best growing plant in the garden this summer, grows in wild from 60 cm to 3 metres in height, i find they grow to a metre in my gardens then 2 metres or more in width, birds love the flowers.
another hardy, drought proof clay plant is the acacia guinettii, i have one that was planted here 3 years ago, or more the point 2.5 years before i moved to the block, so had that long without human care in a zone of low rainfall. is now a healthy 1 metre in height, about same in spread and has soft fern like leaves.