Looked at that model today bushpig, excelent unit. Learnt abit more today about them
Basicaslly they are all supported by whereis.com and the software can be upgraded anually.
Got the bloke to punch in a few random rural towns around western nsw and they all came up ok,,
I spose it comes down to what other options you need like memory storage, memory card slot, blue tooth etc...
Now down to two brands tomtom,navman.