Yikes, I have completely forgotten about Dark Commander!
While Revenge sounds good, I doubt I'll have enough might runes to max it.
Re: Order magic. I was rash earlier in the game and maxed both order and disortion, mostly to boost healing.
However, I'm making good use out of level 3 dispel against those annoying alchemists's special attacks and other effects, such as the gorguana blood thingy. Level 3 phoenix has also been substantially useful due to its mobility in chasing down those stray repair droids, gobots, etc...especially on larger battlefields.
Re: Training. Level 1 is enough? Do you mean just for this build or in general, because I always try to max that early on.