it's a tricky balancing act as your key formations are so expensive.
for the vampire, you really need to take nightwings to neutralise any enemy interceptors as the vampire is super fragile. I would split the scorpions into 2 at the least.
In fact, my personal choice (I've looked at Iyanden but never played them) would be to take 1 storm serpent and a wraithgate. the 1st will give you awesome strike range with a spirit host (90cm if you want the tank to contribute supporting fire, 105cm otherwise), the second gives a 30cm area denial around one of your opponents objs. Note though that he/she may well place the objs differently if you have a wraithgate, to reduce it's effect.
I would then consider a couple of 4 unit ranger fms (purely as an annoyance + delaying tactic), couple of falcon+firestorm fms (always go for 6 units, much more resilient), unit of Vypers for the webway to hit and run, nightwings to CAP or harass broken units, spinners for long range BM placement, single unit of Swooping Hawks for harassing behind the lines or taking out artillery and a guardian fm with heavy and support weapons to guard the blitz on OW.
Something like:
Wraithgate 50
Spirit host + wraithseer 450
Spirit host 350
Guardians + wpns 200
2x 4 rangers 200
2x 4 falcons+2 firestorms 600
Swooping Hawks 200
Storm Serpent 250
Night spinners 175
Vypers 200
Nightwings 300
25pts spare for another stand of rangers. Or you could drop the nightwings and get another fm of falcons/ fireprisms.
Actually, just noticed that you can't take more pointy ear units than dead units, so I'd scrap the guardians and vypers and get another spirit host, like so:
Wraithgate 50
Spirit host + wraithseer 450
Spirit host 350
Spirit host 350
1x 6 rangers 150
1x 5 rangers 125
2x 4 falcons+2 firestorms 600
Swooping Hawks 200
Storm Serpent 250
Night spinners 175
Nightwings 300
The idea then would be to block with the Rangers, while prepping and manouvering for a 'gate based assault. You could also drop the storm serpent and buy a vampire instead. I'd personally steer away from wave serpents as, although they're great, they're also expensive and it can get tricky (or painful) to get a decent engage out of them as you'll have to stay on board to get a 50cm FF range. Plus, the whole point of wave serpents is to protect squishy guardians or Aspects, not rock hard wraithguard.
Hope that helps! I'll have to get round to playing Iyanden one day, Wraithguard are my fave unit
