I think you'll find we have totally different tyres over here. Lot of their catalouges seem to be filled with remoulds & brands i aint ever seen.
Mickey thompsons, Radial or bias & what do you intend to use them for. The bias are super strong, very grippy, horrible to drive on, very expensive & only 1 importer (a few guys bring in the odd container) but really your at fourby's mercy - they also have a really neatish attempt at price fixing. The catalouge has a recommended retail price & dealers who go below it get their arses kicked & sometimes get the product pulled.
Radial's are pretty good allround tyres, wear fairly quickly on bitumen but pretty competent off road, same supplier so same deal.
Supply used to sometimes be a bit of an issue but they seem to have it under control. Same guys also handle cooper & super swamper.
Goodyear MTR are a great all round muddy, BFG aren't bad. Simex you would obviously know about..
Really depends what you want, are they a second set for offroading only?? if not you dont want bias ply unless massive vibration, rapid wear & a hefty price tag dont bother you.
I used to have a tyre shop in melbourne & still have a few contacts up north if its of any use to you when you decide what you want.
Cheers,
Dave.