Hi Tim,
I have nothing much to add to what others are writing. I use Liogier, Auriel, Dragon, and Iwasaki rasps. One in particular is very useful. It is Liogier's "gun maker's" rasp. The rasp part is 12" long and it is 1/2" wide half round. This is an ideal tool for shaping butt stocks and the comb. The long length allows you to reach the entire butt stock from the butt plate without the handle hitting the end of the stock. That is really helpful for shaping baluster wrists and combs.
dave