Fluffy Iyanden is pretty difficult under 1850 for me. Unless you want to ditch some
WG for either Warp Spiders or a Guardian blob I think your list looks pretty good. I'd say for sure consider a farseer as a second
HQ slot and potentially add in more D-Scythes. Normal Wraith Cannons are not all that scary unless against tanks/
MCs. Hordes of Nids or Orks will give you fits. Yes you can tar pit them with T6 fearless troops... chances are that would probably screw up your game plan more than your opponents considering how many points you have in each unit. I hate to post a list in a thread about your list, but here is how I am planning to spend my tax return

.
Farseer - Jetbike, Spirit Stone Anath'lan, Runes of Witnessing
Spiritseer
Spiritseer
20 Guardians - 2 Bright Lances
5 Wraith Guard - Wave Serpent w/
SL and Holofield
5 Wraith Guard - D-Scythes, Wave Serpent w/
SL and Holofield
3 Jetbikes
3 Jetbikes
7 Warp Spiders
7 Warp Spiders
Wraith Knight
Wraith Knight
2k but pretty easily scaled to 1850. Not so much 1750.
A little low on wraith units considering it's supposed to be fluffy, but I don't think people will mistake it for anything besides Iyanden.
Whatever you do will you please post some battle reports with it hahaha! I haven't seen many people rock
WGs and they are
IMHO one of the coolest models in the game.