the trouble under the brand new codex is that although wraith units are cheaper and better only axe boys get an invulnerable save... [damn those ap 2 weapons ]
if you must go for an open advance phalanx try using the DE baron and a spirit seer which should get you a 4+ cover save...
another option ive tried with some success is Illic... who comes with built in shrouded...
i play a lot of DE opponents so never had much joy with wraithlords ! but in a series of games they MAY get their points back...
assume its a typo but at 1850 you only get two HQ's ?