Saucier or saucepan? Whats the purpose of either?
A saucier is more for just that - sauces. The curved shape of the bottom of the pan (it's kind of shaped like a u, and doesn't have the 90 degree angles) is ideal for making sauces in that you can use a whisk and access all of the sauce. The whisk fits well into the contoured shape of the pan, leaving no sauce un-whisked. When you think of the typical sauce pan, with the 90 degree angles, a standard whisk does not fit into those corners. A standard sauce pan should be fine for what you are looking to do with it. I personally like All-Clad.