Sorry to bring this to you, but if you played on Diabolos before, you cannot pick a "new" server. You (and everyone you have previously known) have simply been relocated to the Siren server. In the event another character already existed on Siren with your name, you will have to rename your character upon logging in. And if there wasnt, your name -should- technically be locked into place all those years.
Your options are to pay a server transfer fee if you wish to start out at a new location, or to simply start a new character. These days leveling is so quick, a few weeks will get you past all level caps and into the 99 range for one or maybe two jobs. So either option is viable really.
It sucks, it really does, but there's really not a lot to do about it ._.;
Edited, Aug 7th 2013 10:13am by KojiroSoma
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[XI] Surivere of Valefor
[XIV] Sir Surian Bedivere of Behemoth
http://na.finalfantasyxiv.com/lodestone/character/2401553/