I plan on building a harrower for our home campaign. I can't decide which baseclass I want. Spellwise, I aim for a couple of diviniation, lot's of conjuration and some situational (illusion etc.) spells. I want a good set of crowd control (e.g. color spray, black tentacles, etc.), a tiny bit of blast (Snowball with Magical Lineage) and some utility spells.
So: what would you propose - witch, bard, wizard or sorcerer?