Pookynubbers

I'm trying to find the best option and use of points. I'm going to be in Aukland in late March / early April (and can also get to Sydney if needed) my next stop would be Singapore on to England (LHR/MAN) and then on to the U.S. My plan now is to use SQ from SYD-IAH using 2 $100 stopovers via SIN and MAN so (SYD-SIN-MAN-IAH)

I have a lot of points with SQ, AA, AS, BA, and KE. Any better choices or deals to be had?

Thanks for any pointers!