So it's been a few years since I have played last played 4th edition I think...

I used to play an assassin based Daemonhunters army but have loved Eldar ever since 2nd edition when I used to run a small Harlequin army.

So I have spent the afternoon reading the 59 page thread about the Eldar codex and now can't decide what to buy!

I have 2 main ideas for armies Wriaths or Serpent spam

I will be wanting to play the army competitively hopefully too.

For the serpent list i was thinking of buying - 6 Eldar Battleforce,2 fire prism and a HQ

For the Wraiths - Spirtseer - 25 wraithguard,4 wave serpents,2 Wraithlord ,1 wraitknight and 2 flyers

But I suppose as I have not played these armies and haven't played 6th yet do they work?

Would you suggest a better list?
What unit would be you must have?

thanks for any advice

Sam