From what I could remember, as long as you still remember your password, it still should work. IF your old password does not work, call SE back and ask them to change the password, they will ask you for your Credit Card Number and the Mailing Address for that Credit Card. If the information has been changed or is wrong from your previous information you have, then it's possible that your account has been compromised.

Then that’s a whole other story.
As for which server to choose from; I think it’s pretty safe to say everyone on here will say that they all offer about the same amount of populations and attitudes.