Okay, for First you would need an AONE4, which, Ex-DFW would cost you somewhere around $11,000 (look in the sticky in this forum for recent pricing). Originating in North America, you wouldn't be able to get the 6 NA segments you would originating in another continent. Also, you'd be paying alot more than if you could originate somewhere else. Right now it seems as though CMB (Colombo, Sri Lanka) is the cheapest. However, BKK is good and CAI is also quite reasonable.

I suggest you do a search of this forum for some more info, then post a proposed itinerary and everyone will be happy to help you with suggestions for it.