Originally Posted by kshastry
3. Visit REP and catch a flight back to BKK either from REP or PNH (with no check-in luggage, which is kinda hard as I have to drop shopping plans)
Well, your option between REP and BKK is limited to PG (Bangkok Airways), which will probably interline bags for you. For PNH, i think you are very much into TG territory, and i think buying a oneway TG for PNH-BKK, may save you a lot of hassale as well as let you have check-in bags. The oneway ticket probably would be about $150-200, i think.
good luck, and enjoy Angor Wat.