Well, if you're looking to tailor a little... Definitely DON'T take the Lord of Skulls or the Knight. Those are the natural prey of the Shadowsword's giant overcompensating cannon... 3d3 shots, will wound those on 2+ (with rerolls against Titanic!) at -5 AP and doing 2d6 damage. 500+ points being vaporized in one, maybe 2 rounds of shooting
However, by the same token a Shadowsword is a horrible superheavy to have when all you have to shoot at is cheap infantry, so... Cheap infantry with a good amount of flamers?
Ask not the Eldar a question, for they will give you three answers; all of which are true and horrifying to know.