Just about everything. you'd be hard pressed to find a bad wine from 2004 2005 2006.
If you look at wines in the $18 - $25 RRP price and search for the best prices you'll end up paying $13 - $18 and they will virtually all be top notch.
Have a look through Gavin's list for tasting notes.
This is not a plug for our host Auswine but you could do far worse than getting a mixed case of under $20 reds from Gavin because in the past 12 months he's discovered some serious over deliverers in this price bracket.
I tried a range of 2004 reds from an unknown Eden Valley winery called Fernfield that just blew us out of the water for their QPR. I'm hoping Gavin stocks them because they are a must buy for me, the Merlot was an eye opener, their "Pridmore" Shiraz just superb.
Cheers - Steve
If you can see through it, it's not worth drinking!
Yarra Burn Shiraz Viognier
St Hallet Gamekeepers (great BBQ wine)
Jim Barry Clare Riesling
Braided River Sav Blanc (NZ)
Delatite Riesling
Kilikanoon Killerman's Run Shiraz
Seppelt Sparkling Shiraz
St Hubert's Chardonnay
Voyager Sem Sauv Blanc
Plantagenet Riesling - but many rieslings around $20 are good
Woodlands Cab Merlot (better on the second night)
Yalumba Barossa Shiraz Viognier (ditto)
Glaetzer Wallace
all are are around 20$ (in Perth, so probably cheaper elsewhere), or less on special