After looking at the original PCTECH 20% off deal and looking for a phone myself, I saw the H870K (32GB single SIM version) on sale, but there were a few comments on this deal from people looking for the 64GB version.
And then I found a deal for the 64GB version, and due to the timing, can confirm the price hasn't risen after the coupon became active.
The sale also states it's Australian stock complete with 24 month warranty. Booyah.
Without doing a lot of research, there probably aren't many current flagship phones around with external storage and a proper headphone port.
Personally I am leaning towards the 32GB as I don't need dual SIM and with the ability to pop in an external SD card, I don't need the extra space, but some people might like this.
Obligatory links:
Original 20% deal here: https://www.ozbargain.com.au/node/355112
LG G6 H870K 32GB https://www.ozbargain.com.au/node/355205
AHHH I CANNOT DECIDE WHAT PHONE TO BUY