James Halliday's Top 100 wines of 2012 is now available for free on his website. Take a look!
I definitely agree with a few of his choices:
Chateau Francois Pokolbin Semillon 2006 is a bargain and made by a lovely man.
Tahbilk Marsanne 2012 is from a much underratted grape that can flourish in many Australian environments. It's probably a bargain because most Aussies aren't that adventurous at trying different grapes.
Nepenthe Adelaide Hills Shiraz 2010 makes his list too and it's a great cooler climate Shiraz. It's a bit more refined and interesting than lots of the cheap sun-baked examples.
The Mike Press Single Vineyard Adelaide Hills Merlot intrigues me. I haven't actually tried this yet, but it has been recommended by a couple of people
I haven't tried that many of the wines over $20 yet, but now I've got a list to work from!
The Penfolds Yattarna Chardonnay 2009 is great and on it's way to becoming the benchmark for Aussie Chardies. Tahbilk 1927 Vines Marsanne 2003 is worth the $35 or so it commands and has a bit of extra richness that the younger wines don't have.
More research and development required for me, I think.