You are allowed up to 8 total characters on 8 separate servers with the base sub price. I had wanted to move my old character as well, so I made a few characters on several worlds to test them out. As it turned out, I had to stay on my original server because I am on a legacy world (no transfers out are allowed on legacy).

However, it was a good way to try out some servers I might have wanted to transfer to, had I been allowed to do so. I found out that I really disliked some of the ones I tried (either annoying ppl or too dead), but there were a couple that I thought would work for me.

Before you pay to transfer, make sure you are happy with the world. I fully understand wanting to keep the character you are already happy with.