Hey
From what I know, Citi platinum still is offering a 1:1 deal so the last card is still out there
there is an annual cap 120,000 points though
Cheers
Hi Marvel
You are in luck
I have just completed an exact same trip
get in early and you can fly Syd - Sin - EWR (Newark) on business for all 4
The Sin - Ewr is an all business flight so you may not feel very special, but it is an experience
Cheers