Join the Velocity program. No hassels about transferring points to only one airline, use your points to book Business with V Australia. If there is a seat unsold at the time you make the booking, you get it and it is guaranteed.
188,000 points required plus taxes for a return flight and your seat is guaranteed.
188,000 points is for a "reward seat" - reward seats are capacity controlled just like QANTAS Classic award seats.
If you want "Any Seat" purchase, you have to call Velocity to get a quote. Based on some rough analysis of economy rates, it seems to be at roughly the same rate as QFF AnySeat rewards: 1 point = $0.01. So, for a $8000 business class return ticket, you'd need around 800,000 points.
Edit: Checked online, and you can get online quotes.
SYD-LAX Business-Deal: 332,500
SYD-LAX Business-Flexi: 676,300
LAX-SYD Business-Deal: 332,500
LAX-SYD Business-Flexi: 676,200
That was for some random dates in May. Reward seats were available at 94,000 each way (total 188,000). However if reward seats aren't available, it seems you're looking at anywhere between 665k to 1350k points for a "guaranteed" business class seat.