
There is nothing wrong at all in approaching more then 1 breeder. As long as you are straight forward but what if there's no boys in the litter? Or only two and your 3rd on the list? It would be a watse of time then waiting for another litter, so approach any breeder who's lines you are intrested in. Maybe you won't like them, or they won't like you (unlikely but covering all angles here) Maybe you will see the litter and just not feel that any of those pups are for you in charecter or looks? (although golden fluff balls are hard to resist!)
So go see all these breeders, be straight with them that you are also talking to other breeders as they shouldn't get funny about it (and if they do I would question if I really wanted a puppy from them)
Good luck and also have a great trip to Thailand. I hope to go again one day. (But enjoy the puppy more so!!! :D )