Im looking at a DONE4 next year (possibly February) and using the pricing on the qantas site, it would appear these are my options in terms of price (excl taxes) in AUD$:
ex Australia $9539.00
ex India $8364.00 ($7298 + $1066.00 for return ticket)
ex Egypt $8277.00 ($6761 + $1516.00 for return ticket)
ex Thailand $8245.00 ($7597 + $648.00 for return ticket)
ex Pakistan $8104.00 ($6766 + $1338.00 for return ticket)
ex Turkey $7952.00 ($6489 + $1463.00 for return ticket)
ex Sri Lanka $7486.00 ($6503 + $983.00 for return ticket)

I now have a couple of questions:
1/ Are there any hassles with buying and collecting a ticket out of Colombo ? Can it be collected at the airport ? Or is Istanbul better ?
2/ Would it be better to buy a one way ticket Australia to Sri Lanka/Turkey rather than return and then try and finish trip in Australia by not turning up for last flight segment (which would be Australia-Sri Lanka/Turkey)
3/ Any suggestions on the following itinery with the above in mind ?
CMB-HKG-NRT-JFK-MIA-DFW-ANC-DFW-BOS-LAX-LHR-DXB-LHR-MEL-PER-CNS-SYD-HKG-CMB I would like to get to LAS if possible (not worried about ANC or BOS) but also want to maximise mileage out of the trip and if I could get a cheap one way to Sri Lanka/Istanbul would not be using the SYD-HKG-CMB segments.

Any thoughts ?