Black Metal for me. The only death metal band I really enjoy (though TBH, I'm still exploring the genre) is Death. Black metal is more ambient and atmospheric, IMO.
Keep it for now. Price is low. You can check at your local recycler to get exact prices.
It's way down now because of the economy, but it changes almost weekly. Copper will get you the most money, but I would try to hold on to it for now.
The term scrap metal encompasses both ferrous and non ferrous metals: ferrous - steel, iron, HMS and Non ferrrous - copper, aluminum, brass, bronze etc. Within each scrap metal category there are different grades, for example there is #1 HMS steel, #2 HMS steel, Bare brite Copper, etc.