Arcoona rock dragons, pygmy beardies, paint dragons, central netted dragons. There are so many small dragon species avaliable the list could just keep going.
Most dragons can be kept the same as central beardies, a few expections like forest dragons and mountain dragons but most are very similar.
Quite a few good books available on australian lizards, wouldnt hurt to order a couple and do lots of other research before even setting up an enclosure.
Many speceis will be comfortable in that size however you will need something a little larger to keep multiple dragons together. Ctenophorus sp. Pogona sp Tympanocryptis sp and Amphibolurus sp are just some genes of dragons that would be suitable in that size terrarium.