Any dark chocolate! It can be plain or with caramel, nuts, etc.
I like it because it tastes great, not too sweet and it's generally much healthier over the other types. It is also loaded with far more antioxidants and vitamins when you compare it to milk chocolate. Sometimes if I really want a treat I make a nice cup of coffee and stir a square of dark chocolate in it. Yum yum.
Don't know the name because it's just something Lidl or Tesco does every so often but it's white chocolate blocks with little strawberry flavour pink bits inside.
Then there's pretty much anything Cadbury, Jazzies (the little white/brown chocolate discs with coloured sprinkles) and peanut butter cups.