SYD-LAX (QF11) would be an overnight and thus a good candidate for upgrade, so I'd request that.

I'd also request QF32 as that's also an overnight. If you get the first upgrade and don't have enough points for the second, you can always cancel it. However if the first doesn't come through, at least your request is in for the second.

QF10 is also an overnight flight, but not much opportunity to sleep. You could put in a request for this too and if neither of the first two come through, at least you are in the queue...