Okay.. so.. This is, probably, the first army I've ever actually constructed, for Eldar definately. The 500pts is low, but its mainly for a small campaign for me and a few friends, so we can all get used to our new armies and such, so nothing large or major. I'll be up against an Ork player, a Tau and a Necron. So everybody, please, tear this army to little itty bitty shreds. Mock and ridicule and destroy every inch of it, in the hopes that it'll grow better than before. Any help is appreciated. Thanks in advance 
Farseer;
-55pts
-Guide; 20pts
= 75pts
Rangers;
-19pts x 5 = 95pts
Dire Avengers;
-12pts x 8 = 108pts
Striking Scorpions;
-16pts x 5 = 80pts
+ Exarch = 12pts
== 92pts
Warp Spiders;
-22pts x 5= 110pts
+ Exarch = 12pts
+ Additional Death Spinner = 5pts
== 127pts
497pts
Thats pretty much it. As I said, my first Eldar army, so any help is appreciated. I sitll have to buy everything, as I currently own no Eldar models, so there arent really much in terms of limits or constraints.. I was thinking about taking out the Scorpions for some Banshees; weaker, but faster movement, even if its only for a bit. Whats everybodies thoughts? I used to have two squds of 5 Rangers rather than the Avengers, but I thought perhaps the Avengers would be more applicable to the army, maybe even more effective. So.. anybody wanting to lend a newbie a hand?