I don't think the wraithlords need brightlances- overpriced and you are covered anti vehicle with two squads of FD and Farseer/warlocks who count as strength 9 for purposes of vehicle penetration.
I would also be tempted to play at least some pathfinders- exceedingly difficult to kill, due to 2+ cover save, especially if you put some harlies in aswell, wound on 2+...
If it were my list I would play at least one squad of hawks.. but then I love the way they play, especially beside jetbikes, And they could have a place, but it depends if you like them or not, because if you don't like their style then there is no point using them!
Hope I help
Jetbikes,Hawks&Prisms? At 700 Points? Works for me!