If you are talking about making a new Character... You are not restricted to just one server, if you have a latency issue with that server, delete that character and try again on another server. You can have up to 8 characters on one server with a max of 40 for the game so there are plenty of chances to find the right server for you.
Ah, I forgot to mention this.
I'm a legacy member player. Therefore, it will be troublesome if there is no world transfer service after official launch.
BTW, any NA or Canada player have tried JP server? How bad is it to play on server with 200+ms latency? Were you fine during Ifrit fight or other raid battle?