What boxing bag would be good for a begginer?

k so im just starting boxing and i have to purchase the equipment from my own money. i have around 150$ . would you suggest i buy a speed bag first or a heavy bag?|||You'll actually get more use and benefit from a heavy bag. Go to any sporting goods Store, or Ringside.com or Title Boxing and get the basic 70 lb. canvas bag to start. Work the bag like you would an opponent and box it, just don't bang away at it. Try different styles|||the heavy bag first power and technique then speed...|||I would buy a heavy bag first, speed bags come later.