Heavyhand, Duel, Infantry Training, Body Development.
That's a great baseline.
If you have Wards (Toxic, Spirit, etc.) then re-spec them away. They are garbage-tier IMO.
Precision Strikes and Massive Criticals makes the most sense to get next.
One point of Magical Training can allow you to use a Scroll of Circle of Restoration, that's handy if a party member goes down, but IMO it's fine for a Warrior to chug Potions of Lesser Restoration and make Hirge do the Scrolls. But Magical Training does allow that to happen and some think it's worth a point for the flexibility.