Not sure what to make of him. He's nigh unkillable sans cannons (no, you're not going to a Giantbane wielding character into combat with him, he'll have ASF and will force feed you your own intestines), which means he can't be stopped casting spells which don't require Line of Sight.
However, as 1000pts just think how many cannons, trebuchets, or casters that is facing him. Sure, he can summon more. big whoop, think how many more dispels are available. He's still stuck with the same crap amount of magic dice. He can summon more creatures? Oh well, just use your extra 1000pts or more. There's no way that Nagash is worth those 1000pts.
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