I actually like Wraithblades with the axe and shield. They are a tough unit that can take a hit with T6 and 4++ save and they will stick in combat, which can be a problem as they only have 1 attack. But, put a Shadowseer and the unit has Hit and Run to bounce out. The problem is they are slow, so so slow. The runes of Battle power Quicken helps though. I run them in blobs of 8-10 on foot. A Spirit seer or two with a Shadowseer and you can cast Psychic Shrieks and the Harlie leadership powers. I like that its a tough unit to compliment the fragile Harlies.
But, you will need some speed, so a Windrider squad helps a lot. Wraithknights or Wave Serpents with Dire Avengers are also nice options as they are the best units in the book and the Serpent shield has pinning to maybe help with overwatch that will kill your clowns.
Rangers though... yeah, I can't get them to work for me.