From the title options I own only the NZ south and all I can say that choice should be made by what location interests you the most. If you are interested in flying NZ and perhaps own ORBX Australia and like to do some flying between them, then it is either one of the NZ scenery. If you are mostly flying in Europe and like to do some hops in England, then go with the England. I own every single ORBX scenery except NZSI and England and every one of them is a quality product. So in my humble opionion, if you have limited possibilites to purchase only one of those, choose an area which interests you the most. In quality terms you can't go wrong and even the "old" ones, like Australia, are top notch.