Cracks knuckles, right lets see what we have here then...
Sorceress - level 2, Darkstar cloak, Focus Familiar = 185pts
Sorceress - level 1, 2 dispell scrolls = 150 pts
Assassin - Extra Hand weapon, Man Bane = 121pts
5 Harpies = 55pts
5 Harpies = 55 pts
5 Dark Riders - Repeater Cross Bows, Musician = 117pts
5 Dark Riders - Repeater Cross Bows, Musician = 117pts
18 Corsairs - Full Command = 205pts
5 Shades - great weapons, light armour = 95pts
5 Shades - great weapons, light armour = 95pts
Cold One Chariot = 100pts
5 Cold One Knights - full command, Sword of battle = 190pts
Not bad, but I would drop the Corsairs, they are an odd fit in our ranks, if you want a cheap infantry fighting unit take warriors, if you want a shooting unit take warriors with Repeater Crossbows... Corsairs are nice models, but when compared to the other rank & file infantry we have in our core, they are not that good.
9In their place Id add a War Hydra, drop the light armour on the shades, it is useless. Drop the sword of battle on the Coldone Knights, and get either the banner of murder, or the Warbanner. You shouls then have enough points to upgrade the second sorecress to a second level. I would try and fit in small units of repeatercrossbow elves for the Sorcress to hide in.
Good luck.