Your proxies can be any region that you choose, because super fast speeds are not all that important for most of these sites (decent speeds ares still fine). Your best bet is to get proxies that are located closest to you or your server. So, if I live in New York, East Coast proxies are the best for me (NY, CHI, VA, etc.). Moreover, you should take into account where the site's servers are located if you want to have reliable speeds.
