The world is your oyster if you're looking for places with great choice and cheaper than Canada. My advice,
First, choose your location by the type of girl you like. Thailand is fantastic, I've been many times myself, but if you are super into black girls, then you're going to be disappointed. Once you've chosen the type of girl you're after, next consider budget. Be realistic, think about not just the price of the girl, but other expenses such as travel, accommodation and food--think of maximizing the amount of money you have left for fun. Some guys could care less about where they stay, for others it matters. Just remember that if the point is to have a good time, girls may not be the only factor. If you're trip is two weeks, definitely consider what you're going to do during the hours you're not chasing a girl or actually fucking her. The location you choose will largely dictate that.
I know Thailand well, I've been to Brazil, throughout Central America and the Caribbean and of course throughout Europe. If I had two weeks, no doubt I'd go to Thailand again, even though Asian girls aren't my first pick. If I had a week or less, I'd head to an east European place, just because those are the women that most turn my crank. My most fun fuck trips have been to Russia, Czech Rep and Croatia.