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For me it would be World of Warcraft.
I would have to Guild Master Realm Transfer for $35 USD (to transfer all my gold and keep my lvl 25 guild) and give up on all my alts. Of course, I refuse to do this. If I cared less about greedy companies and if $ was not issue this would be my 1st option.
4-5 months, I'll respond later on. I need to dig some info on which MMO should be avaliable around then. Hopefully some of these:
FFXIV: Realm Reborn
World of Darkness
Phantasy Star Online 2
Blade & Soul
Shroud of the Avatar
Elder Scroll Online
Starcraft oldschool aka wise/04. SWG/UO aka Wise HeRo, Light Jedi Knight pre-cu (Bria)