Looking to book 4 awards NYC-REP or BKK or RGN in Feb'16.

There's availability via ICN on OZ.

UA prices the itinerary at 160K miles + $40.

My balances are
UA 88K
Chase 230K.
So I can get 2 awards on UA.

Not sure how to get the other 2 awards.
I have 270K in MR and 220K in City TY.
It would seem to make sense to book it on SIN.

AC prices out the award at 155K + $500.
I can't get pricing on ANA or SIN, but probably similar?

Or is there a better way?