I tride this list on a small field and completly destroyed a chaos army, but I would like suggestions for a increasing it to 1500 points

HQ
1 Farseer, Spirit Stones, Eldrich Storm, Mind War, Fortune, Runes of Witnessing,
and a Singing Spear.
7 Dire Avengers, 1 Exarch with Diresword
14 Guardian Defenders, Eldar Missile Launcher
5 Wraithguard
1 Wraithlord with a starcannon
4 Dark Reapers, 1 Exarch with Shuriken Cannon and Fast Shot

Total
998 points