Warforged paladin and warforged rogue 2/wiz 18 maybe?
In a W/f duo the wiz can swap from blasting to healing in situations where the paladin can't keep up. Gives the flexibility of healing without it being a focus.
I haven't done the tank/squishy duo in DDO but in other MMO's I've played the caster didn't need to move around much. In fact teaching them to not do the caster chicken dance was usually step one.