Best Optus Mobile Plan?

I currently have the $40 10GB Optus post paid plan.

The wife is with TPG and i wanted to move her to optus so i can share my data with her but all the plans i see in post paid and prepaid look crap.

Is there any decent plans for about $20 a month no need for unlimited but say 100minutes a month and still share my data?

Alternatively is there any prepaid/postpaid with another company that is $20 with 2gb data(better 3)?