Thanks for the feedback... I had held First Class seats on TN for both the outbound and return but just managed to score First on Qantas for the return (which actually works out better anyway since the service is daily) - so 290,000 miles and $200 later and its all done.

Now I just have to wait 9 more months for the trip (and the wedding)... but that gives me plenty of time to earn some more SPG points.