I have to be honest; I am a bit fussy when it comes to the bowls I use in cooking. You gotta have good sturdy, functional bowls for use throughout your cooking are essential. You cannot be using regular serving bowls for preparation (they'll get damaged or worn from beaters and whisks, etc) so get some hard-wearing beasts like this. I have 1 of each of the large ones and a stack fo 10 smaller 500ml ones. I use the smaller ones when I'm preparing components of dishes before combining into the bigger ones.
Lets go shopping...
And this guy...you can't have enough of this one...