As for orange named, I typically start with an Ottos Irresistible (I want no chance for failure), and then follow up with holds and/or level drains to speed their demise. Your method works just as well (and is cheaper sp wise), its just up to personal preference at that point.
Going enchantment focus (Enchant Archmage + Magister: Enchantment mastery) is a great solution if your DC's are a bit lower. It will allow you to still get a high enough DC in enchantment to be a major contributor in EE content. Just make sure you don't waste half your blue bar, throwing out death spells (other than wail for the debuff), that have no chance of landing.