I found this pattern whilst searching for Daleks. It is the best pattern I could find and believe me I looked a many; fantastic pattern and easy to follow instructions. This took me what felt like an age to complete though but I do crochet VERY tightly when I'm making Amigurumi figures, so it's my own fault really. It didn't help that I didn't know all the stitches for this pattern either but they are all easy to find and learn from the Internet.
Here's my Dalek:
Obviously Lucy Ravenscar's Daleks are way better than mine is. She has other free patterns too so check them out!