I recommend if you can only get one, a heavy/grappling bag of around 80-100lbs. Dead weight is crazy to roll with if you're not used to it compared to a person, and 80-100 is a decent amount for a heavy bag. Title, Everlast(mine), as well as (supposedly)UFC make good ones.
I've never used or heard of much use from those around me of a teardrop bag, so I wouldn't know. My only concern would be the oblong shape and whether or not it limited the bag's versatility...
Sig courtesy of that photo-matic magician limba
I went out the way that I fight. I went out on my shield. Thatís it. Done. --Chuck Liddell
My goal is to end my opponent --Carlos Condit