Outside of plans, there is also great value with Boost 12-month prepaid if you can plan for a big one-off payment per year. I originally chose it due to having better coverage than other providers (uses the full Telstra network) and low per month cost for primarily call/sms usage.
I'm currently on a $230 recharge for 12mo/160Gb, making this $19.20/month or $1.44/Gb. Due to change in avail plans, next recharge will be $300 for 12mo/240Gb (calculates to $25p/mo $1.25/Gb)
Thanks, I've had a look over your spreadsheet and see a lot of better choices for purely $/data.
I'm lucky to have wifi access most of the time so my primary concern was being frugal with an acceptable amount of data included.
I'm still salty about the Optus breach so I won't use their network.