Taylors Promised Land | Yalumba Y series and Jacobs Creek.
Beginning to see the theme? These are big companies | known names with reputations and not someone or something obscure that you have only heard of recently.
Buy the major grape varieties | Chardonnay | Semillon and Riesling | Shiraz and Cabernet are the start of under $20.00 value. If the winemaker bottled it without blending with other varieties there is something to be said for the wine.  Australia has many great winemaking teams and great grape resources so picking out the major varieties. When it comes to under $25 you can even find interesting varietals such as red Tempranillo
or white Vermentino.
Hey ok | you don’t know your Promised Land from Your Running with Bulls so what should I do I hear you ask? Buy the most expensive that matches your budget so if there is two wines of same brand | buy the more expensive of the two every time.