South of West St/Brisbane Ave, between the shops and beach is the most sought after (and expensive).
2nd best is west of Ocean Beach Rd. There are a lot of townhouses and houses with granny flats in the backyard. Hard to get a block bigger than 500sqm. If you find one, it will be a premium price. The closer to the beach, the higher the price. Also near the shops is pricey.
A good area is between Sydney Rd and any street up to Veron Rd. Watch out for the flood prone streets, around Shepherd and Lovell Rds. Also a lot of streets are quite busy traffic wise, so pick a quiet end if you want to avoid that.
The area around Shoalhaven Drive and Grafton St, Woy Woy is nicknamed "The Bronx", due to a lot of housing commission homes bring there in the past. But a lot are privately owned now.