Hello,
I need to book a flight from SFO-SYD-SIN-SFO in late June. It doesn't need to be with any particular airline, but am looking for hopefully a very reasonably priced business class fare, or an incredibly comfortable economy plus experience with nice wide seats (at least for the two longest legs). I would like to book it all as one itinerary, but if it'd save a substantial amount of money, could book as separate flights.

You guys are always good with pointers - any idea which airlines I should focus on for these legs? Looking around online admittedly has me feeling a bit overwhelmed, and the business class fares I'm finding are in the $10k range per person.

Any advice appreciated!