Ah...this varies with me over time. Right now I'm really big on ginger: both lemon ginger cremes and ginger snaps. But I have a great deal of fondness for any kind of peanut molasses cookie (that is, a molasses cookie with chopped peanuts baked in it), too, from nostalgia of my youth. Oatmeal raisin cookies are good, as well as any kind of mint chocolate cookie (though I'm particularly fond of the Girl Scouts of America's best-seller, the Thin Mint cookie).
Oatmeal Chocolate Chip is my favorite by a longshot.
too bad they're fatening
:(
mmmm,mmm, good!