Yeah mate, ideally you'd get somethinng that can cover the ground quickly. Assuming it can find a bit and will swing off a pig, pace is the big thing. Don't go for the maximum pace though because they can often over run things and have trouble turning...
Did you say you lived in that country or just your spots are in that country? If you live there ask every pig chaser you see what they use. Evenutally something will emerge that's working for the locals.
We could all list breeds to follow but it's more about the family of dogs all these dogs are wrapped up in. Working stock of whatever breed will do the job, it's just a matter of your taste.
Talk to blokes on here who are from places like Goondiwindi and CQ. That's where I'd start.
Cheers.