I'm tempted to do an all warrior/rogue no mage party on a playthrough the criteria will be:

Alistair, Oghren, Sten, Leilana, Zevran and Dog are allowed.

Shale is on the fence of do I allow her or not, she's a DLC character and I'm kinda interested in keeping it to the main game characters only. Now I know that until I recruit Sten and Leilana in Lothering I will have no choice but to allow Morrigan in to the party, but there should only be 2 engagements involving her really so thats not a problem.

(SPOILER)I will also have no choice if I want to save the son of Bann Tegan but to allow Morrigan or Wynne to enter the fade. Same as if I want to actually recruit Wynne in the first place, she either joins the party in the tower or else she attacks you and you're forced to kill her. I might just kill her and be done with that though since I will not be using mages in combat except where forced to do so.