Nice iron/steel pan (wok if you know how to handle :P) - searing, baking, frying, sauteing
nice high powered blender (I use vitamix but I think ninja blender is cheaper and is pretty good) - making soups, slushies, smoothies, protein shake, etc
casserole (any ceramic base casserole) - baking, lasagna, pasta and all those things
iron/steel pot - make stew, broth, chili, gumbo, etc