iambazza,
Given that it comes down to AA or QF in my view. Unlikely with that amount that you could go for both

QF advantages
- Easier to get to sapphire/emerald using paid J or F (including YUPs)
- Access to AA lounges on US domestic itineraries
- Ability to upgrade QF metal (important given this seems to be your main longhaul)
- Ability to combine with Aussie credit cards
- More achievable lifetime status (now that AA has gone BIS only)

AA advantages
- Generally better earn/burn rates
- Upgrades on AA domestic legs
- Status challenge to move you up the ranks quickly

Personally if in your position I would value the ability to upgrade the longhaul legs, but others will look at the earn/burn ratios.