If you don't allready have Venoms to transport your Troupes, I reccomend you get those. Without them your Troupes will get shot up before they do you any good in combat. Just be sure to put the Venoms in cover, they dont have a very good AV from what I remember. The Harlequin wraithlord looks like an Eldar wraithlord, except he has a Harlequin Jetbike faceplate as its "face"... If you were to take a Wraithlord in the future, be sure to arm him with a D-Cannon, its just too good to pass up.
Hope that helps