Well, I haven't heard the Wadia 6, which is the model listed on eBay Australia, but I do have a Wadia 581i SE. If you think the player on eBay Australia is pricey, there's a new 581i SE on the regular eBay site that's available for US$8200 (which is still over US$3000 less than the retail price).
I still really like my Wadia, primarily because it seems to be built just for me. A solid build. A very nice-looking display, which can be shut off when listening to music (which actually makes a difference on this player; when the display is on, it lets out a faint, but audible high-frequency sound, which becomes immediately apparent when the display is switched off). A great-looking and solid remote control. Buttons on the front so that I really don't need to use the remote for everyday usage. Digital inputs and outputs on the back for use as a separate DAC or transport. Balanced and single-ended outputs, which can be used simultaneously (allowing the use of a balanced amplifier and a single-ended headphone amp at the same time). Three different D/A conversion routines in case one of them doesn't float your boat. A well-defined upgrade path to the 781i model. And it sounds great.