viegraff is good to complete first campaign, you wont need much mana because it isnt hard at all. but when you going to do caves then you should use grullborg grimtooth, he has 3500 mana, which makes the caves easier. with viegraff and only 2900 mana it will be harder to complete caves.
LOVE this game, needs badges :D. and i agree with drpain, more control over summons, i also dont want to have my skeles run through the room like a stupid behind me, sometimes they dont even attack if i do 0.o.
Or rather, the entire area youre in collapses in on you :P