Well, there is a way you can help us narrow it down for you.
What kind of army would you like? Everything on foot? a Mech army? An all-jetbike army?
Once you decide, you can think about buying models.
http://www.dakkadakka.com/dakkaforum/posts/list/402275.page
This is an excellent Eldar article and will give you a run-down of what our units to best. Once you've decided
PM me and I'll be more than happy to help!
Iranna.