Thanks txl.
I will look into the RTW information.
Right now written on paper, I have:
OMA -> SIN (1 way) ~ $500 (United),
SIN -> Thailand (1 way) ~ $60 (AirAsia or Tiger),
BKK -> TXL (1 way) ~ $450 (LTU),
FRA <--> OMA (roundtrip) ~ $500 (United)
So it's looking to be around $1500 plus taxes, surcharges and international departure fees. So hopefully below $2000. I haven't decided if I want to use miles for any free flights, because that means I will lose my status on United for next year.