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Everyone who had a SoE account gets 45days free.
There are several completely dead servers out there so it's important that you roll on D&G if you want a populated server for PvP.
Public Enemies is populated too but is less so then D&G.
I think PE has a better community / players as a whole but it doesn't matter anymore since they're merging everything.
There are two PvE servers that are also populated but I'll leave that to the PvErs to suggest.
edit: Fixed with the official link. Thanks Ryukan.