If you're going full mech eldar, and plan to bump the list up to higher points totals later, don't bother with the mini seer council. If you really really like the farseer, then keep him. (I think he is nice, but when you don't get those powers off it really hurts your battle plan, and with the rise of psychic powers, I think people are going to bring more psychic defense, so until eldar get redone and get super awesome abilities, I would learn to play without depending on him) I would just go with a minimum Autarch and spend those point elsewhere. He also gives you the nice option of reserving the army when you face someone that has a big alpha strike.
2 units of 5 fire dragons rather than 1 big one. You are not going to even need 5 meltaguns in most cases, so just take the minimum unit and you will kill whatever you shoot at anyway.
Eldar have quite durable (if expensive) transports, that can pump out quite a bit of firepower on their own- so use them. Don't ever plan to get your dire avengers out unless their transport is blown up. Take minimum units of them and just think of them as an 'upgrade' to the tank to make it scoring. You will also appreciate having more scoring units.
All the upgrades on the tanks are cool and all, and while you may think they are needed... they aren't. The only upgrades I would take on eldar tanks are the underslung shuriken cannon (always take this) and holo-fields on falcons.
Autarch 70
5 Fire Dragons 190
Wave Serpent
TL Shuriken Cannon
Shuriken Cannon
5 Fire Dragons 190
Wave Serpent
TL Shuriken Cannon
Shuriken Cannon
5 Dire Avengers 170
Wave Serpent
TL Shuriken Cannon
Shuriken Cannon
5 Dire Avengers 185
Wave Serpent
TL Scatter Laser
Shuriken Cannon
5 Dire Avengers 185
Wave Serpent
TL Scatter Laser
Shuriken Cannon
Falcon 130
Shuriken Cannon
Shuriken Cannon
Falcon 130
Shuriken Cannon
Shuriken Cannon
1250
Lots and lots of dakka. You're pumping out quite an absurd about of S6 shots for transports and infantry, you have the fire dragons for anything bigger that the S6 can't handle, and you pick up another scoring unit. I personally like the falcons (if you keep them cheap enough) over the fire prisms solely because they can pick up your dire avengers if their forced out of their wavesperent. But this is a personal choice, and if you prefer the fire prism, that's fine as well.
as a side note, make sure to magnetize your grav tanks weaponry! You won't regret it, and will love the flexibility when you change/upscale your list.