It's only ~$90 more for the Z5C than the previous CWEDDING20 deal but you get local stock. Worth IMO as I've had bad experience with grey imports dying right after warranty period. You can even go back to qd_au to get it for even cheaper now at $575.10 after discount.
MobileCiti are also selling Z5 for $803 after discount:
http://www.ebay.com.au/itm/Sony-Xperia-Z5-E6653-4G-LTE-32GB-…
I couldn't see any Z5P Au stock for sale but plenty of sub $1000 grey stock. Taking off 10%, you can get a grey for high $800s.
Need a case to go with it? You can go to the Sony Store and use the gibberish $30 off coupon for an official case which will set you back $39. See the comments in https://www.ozbargain.com.au/node/224828. I ended up getting one coz I only ever found decent Z1C accessories in Japan.
And remember to use cashrewards for 3.3% cashback.
I treated my z3 like my firstborn,
Found a hairline crack running the length of the back of it,
never again will i buy sony.