Skyrim IV: Oblivion

[Douglas]

wish I could find a good one for Chaurus Eggs, I've got enough of them for a couple of playthroughs of the game

Make invisibility potions with them. It's one of the more valuable effects, and it's their fourth property.

The effects you should be looking for to produce high value (and therefore good for training) potions and poisons are:
fortify or damage any kind of regen
invisibility
slow
paralysis

I'm not sure whether to add frenzy to that list.

The Giant's Toe ingredient inexplicably produces potions worth a lot more than their effects would indicate. If two potions have identical effects but one was made with a Giant's Toe and the other wasn't, then the GT one will have a much higher price tag. Combine this with it having one of the top value effects (damage stamina regen), and it can be used to make some spectacularly pricy potions/poisons.