I am an eldar player, and im not quite sure why im telling you this, but the secret to defeating the army list you have shown us is............(zzzzzz)...... ow, sorry, gettin tired. Anyway, ignore the wraithlord until he is within 24 inches of your army. If you go off chasing him with even one squad, that is where he is going to hit you.
Shoot, shoot, shoot the banshees and vyper with whatever you can.
Assualt the rest with large numbers concentrated onto one squad at a time. Make him redirect his battle plan to fit yours.