Last 2 laptops I bought were Asus and both very good . Large screen but very light in weight and do everything I need it for in general use . Powerbuy or Lazada usually have good deals on them but if buying from Lazada try make sure it's either from Asus direct or one of the sellers like Banana IT etc.
Think I paid 12000 bht or near that for my latest one from Lazada.