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1. Mountain Guards: +5 to defense won't hurt.
2. Harpooners: They deal noticeably more damage, and I wouldn't rely on archers with their crippling wound.
3. Against Necropolis: Bear Lords are effective; against everyone else, use Northern Riders.
4. Berserkers: Due to their Berserk Rage ability.
5. Arcan Priests: Cross-attack is great, and there's a higher chance they'll cast a fire spell on someone.
6. If you have Armageddon, use Jarls; if not, use Earls.
7. Lava Dragons: Due to their Lava Shield ability.
Something like that.