Go pure artificer - although I'm a great fan of a 2 level dip into swordsage for evasion + that concentration -> reflex saves maneuver, then use your metamagic spell trigger to persist starmantle. Congratulations - if you have a concentration score of 14 or more, you are now immune to weapon damage - as long as you keep recasting starmantle, which, with a 24 hour duration, lasts you long enough to rest up again.