Which ADSL Wireless Modem

Looking to upgrade Billion 7800NL wireless modem but it's been such a long time I'm honestly not sure where to start. I only have access to ADSL where I live (not ADSL2+ or NBN). Live in Australia.

I'd like something with 802.11ac but beyond that I just want value for money.

It'll be used to connect:
2 desktop PCs
2 laptop PCs
3 tablets
2 mobiles
2 smart TV's

Keep in mind it'll be rare that more than 3 or 4 of these will be in use at any one time.

Sometimes my wife works from home - it's be nice if it was possible to prioritise her remote desktop connection over the kids Netflix videos if that is possible.

Any recommendations or suggestions?