Protoss purchase list

Hi!
I'll be starting Starcraft TMG with some friends, and i'll be playing Protoss. Seeing that preorders will be up on the 10th i was wondering what a good "buy list" could be. Of course i'll go for 1 starter and Adepts + Stalkers (which if i am not mistaken are not in the box).
But how many of those should i go for?
Should i aim for 2x starter? Is 1 copy of Adepts and Stalker "enough" or they are worth buying two?