Adwords Question...local or everywhere

Hey BHW,

Just a quick question. Is it better to run your adwords for local users or international.

I have found a few niches with 14 000 searches and 3000 local searches. Would i get more targeted traffic by running it local, although the niche isnt specfic to my country.

The site has an amazon store and a few affiliate links.

Or is this somthing i just have to experiment with.

Thanks