Alright, I've looked over everything, and I'm not really sure about the warblade level.
Since I'd only be taking one level, it doesn't seem to offer much of value in terms of maneuvers and stances, and would cost me a feat for Armor Proficiency (Heavy) to get the spellsword level.
So warblade is 3 maneuvers and 1 stance of questionable utility as well as -1 feat and +1 to Reflex. Fighter is +1 feat.
As for battle sorcerer/stalwart sorcerer, since I don't need the weapon proficiency I've considered brewing an alternative that doesn't lose spells known and doesn't get armor or weapon proficiency. I'm okay with losing spell/day, since Meridius can always pick up extra Charisma.
Any other suggestions, esp. for higher levels?