More thought will go into this decision then when I choose a wife so I understand and I feel your pain
We don't yet know how many slots an account will give, so as an altaholic I have plan A, plan B, plan C and plan D LoL.
Plan A: I want to play one each of the 4 roles: Tank, Healer, DPS, CC.
Plan B: I'd like to include Magic DPS, Melee DPS, and Ranger(I love Archers) in my DPS category.
Plan C: I'd like to play one of every Race.
Plan D: I'd like to play one of every class.
(I really need to work on a strict sleeping schedule to make sure I get enough)
The more it goes, the more I tend to incline toward Monk due to many factors.
1) I like to DPS in melee and I also like to be able to sustain some damage in needed
2) Despite enjoying tanking, I do not like to do it constantly and I prefer to have it as an offrole than anything.
3) I like a character that has some autonomy, the combinaison of FD, mend wounds, taunt and defensive plus offensive cooldowns fits me much in that regard.
4) I'm very fond of "Body as a weapon" style, wearing only monk Gi and using bare hands if possible (or discreet monk weapons).
That or the direlord which seem like an offensive inclined tank, but for now the Monk please me more.
I'm waiting for the Bard reveal still - makes it difficult to get excited about a game when all of the playable characters have not been revealed yet :(
I need to either play a class that is highly desired in a group (which I'm hoping will be Bard), or box 2 characters because I likely won't have enough playtime to LFG for more than 30-45mins per session. If Bard gameplay isn't that great I may end up trying to box a healer/tank duo (probably some combo of Shaman/Druid/Warrior/Paladin depending on their gameplay) or maybe a pet class if capable of some solo content (but that would be my last choice).