Undecided on my sub am I as well. So here's my plan.
I'm keeping war subbed until my sam is lvl 30. Then I'll have meditate, and the true power and worthiness of a sam will begin. People will invite me into parties because I'm sam and not because I can provoke. But, finding a party without meditate is hard, so war will help me there.
So in the mean time, I'll contemplate my sub choices. I thought maybe ranger, but I heard it really doesn't go well with sam (rng/sam however is deemed excellent). I always thought about drg sub, but that's not really a job to be subbed. I thought about nin, but without dual wield, what good would nin be to me? I also thought thf, but...eh, we'll see.
So right now I'm getting parties like mad and its easy street for this sam. I'll have some time to decide.
By the way...
Dear sweet Jebus.