I dont know what kind of regulations you guys have down there but if you are looking for a double shootgun the Browning Citori's are a very nice over/under. I have a Browning Gold Hunter and love it but that is a semi-auto and I am not sure if those are illegal down there or not. I also have a few Winchester shot guns and they are all pump shot guns they are very nice.

But if you are looking for a double I would really look into a Browning Citori they are very very nice looking shot guns and can get them in either a 12 or 20 gauge.

I dont know what you are going to hunt with it but I would go with a 12 that way you will not be under gunned and it sounds like the ammunition is more avalible.