Half fighter half mage can certainly work, but it'll likely be point intensive.  You'll want to have a number of spells on you and/or foci to sustain your spells.<br/><br/>One option would be to be a mystic adept where half your stuff would be dedicated towards fighter-y (adept) stuff and the other half would be dedicated towards mage stuff.  That would limit the power level (Force) of the spirits you could summon but it's quite doable.