Yeah in my opinion if you are going to spend a lot of time in a PrC don't take Improved Familiar. The levels don't stack as far as the familiar is concerned so they would be stuck.
And the above mentioned 3 are some of the best of the basic choices. And style-wise you can include Raven, Bat, Lizard, and Snake, though their bonus' aren't as focused as the others (IMHO).
But as something different to think about is the Monkey. It isn't on the standard list but looks like it should be. (Plus it is a cool little 1/6 CR critter that I found in Dweomercraft - Familiar).
And the above mentioned 3 are some of the best of the basic choices. And style-wise you can include Raven, Bat, Lizard, and Snake, though their bonus' aren't as focused as the others (IMHO).
But as something different to think about is the Monkey. It isn't on the standard list but looks like it should be. (Plus it is a cool little 1/6 CR critter that I found in Dweomercraft - Familiar).