I played Biel-Tan early on in my Eldar days (you know, like 3 months ago...) and found that I didnt like the lack of maneuverability very much, so I started playing around with Saim-Hann. Sure, I really enjoyed every stinkin' unit moving 35cm, but I also realized that I was missing the cheap activations, and ability of a larger unit of infantry dug into some woods or a building being much harder to break than, say, a smaller unit of jetbikes.
So now Ive gone back to the basics in an attempt to get my Eldar tactics down. Just like when playing with soap bubbles, the user can break them as easily as the enemy if not careful. Once I get my perfect balance down, I'll let you know

I can say, I really love a unit of Guardians with 3 Wraithguard and 1 or 2 Heavy Support platforms. 300 points for such close range firepower and survivability isnt too bad. Or do that once and augment it with 2 non-upgraded formations and you have a solid base to defend your side of the board with.
Paint up one group of Falcons to be, well, Falcons, and paint the other to be something like Firestorms. Use your newer Wave Serpents to transport a single unit of Aspects. Thats 3 units of Mech right there. Add some Jetbikes (I LOVE Jetbikes, usually with 1 or 2 Vypers), and dont be afraid of Swooping Hawks or Shining Spears. Neither need transport, both can wreak some havok, and SS's obliterate tanks. Being almost twice as fast, skimming, they nullify
Reinforced Armor with their
Lance weapons. Supported by a Rolling Assault, above, shaBAM. The only thing you need to do is lull the tanks away from their own supporting fire. A supported tank company is SCARY! :0
One last thing...as you plan your Rolling Assault, keep your units back as far as you can while still getting your maximum amount in the 15cm range. Hitting a spread out formation from their flank will help achieve this. This will prevent his Counter-Assault from bringing in his whole weight to bear on you, and can also limit his Supporting Fire, as those supporting units must be within 15cm of one of your units to fire. I believe this is termed a Clipping Assault, and is an extra-fast way to break enemy formations, including tanks! (I love crushing scouts this way...which includes IG Storm Troopers whose Valkyries are ranging ahead of their deployed cargo!)
So, in summary:
3-4 infantry units. Reinforce as your points allow
1-2 ASpect formations. 1 mounted, 1 not
1-2 units of Jetbikes
1-2 units of Falcons with Flak
1 Nightwing
1 Scorpion
I think you have the makings of a solid army right there. As you discover what you love and arent so fond of, you can tailor the list to your own preferences (obviously), but IMHO thats a great place to start.