personally I would see this as a tactics question, but since you will most likely be posting a list here, it can stay here for now. If it falls more under tactics as the thread evolves, Ill move it there
*Mod Hat off*
Ok, if you want an assault based army I would look more towards the coven style. That makes your units tough enough to get across the board and into combat. That being said your also need to supliment your AT that you would be losing by not taking ravagers in your HS slot.
So your list will probably come out like this:
Whatever HQ you want
1x unit of grots/incubi/harlies
2x unit of lanceborn
5~6 units of mix warriors/wyches/wracks
1x unit of beasts
3x units of talos/cronos