I basically like Omni-classes. Something where I will be able to excellently fulfill as many roles as possible. In Alpha Omega, this usually just means Arcane wielder with a few ranks in every field, by the end game, because barriers are just super-OP and so is the damage possible to do.
Just to give a perspective on that:
Max HP, using the core rules= 210.
Max damage when doing direct damage= 6d20x25.
Max HP a barrier can give= 80,000.
Being able to have an 80,000 damage barrier, and be able to do an average of 2000 damage to an enemy that, without cheating, can only have 210 HP? Priceless.
My GM ended up having to give enemies armor that resisted my damage to the square root of whatever I did, so they would stay alive.