Shrew Throwing Knife: 2 lbs? Wowzers!
I thought KBar's (~1 lb) landed with a very satisfying thunk -- but the knife Ron offers is twice as heavy!
The Gil Hibbins' throwers are light. Learn how to handle all three sizes and you will have accomplished something.
The Cold Steel throwers, weight wise, fall between the Hibbin's knives and KBars and are fine for throwing. I've got three and haven't worn 'em out, yet.
Please wear eye protection! It doesn't happen often, but every now and then a thrown knife will bounce back at you travelling every bit as fast as you threw it. It's happened to me when throwing at a tree, a blob, and a soft wood stop. It will be unexpected and you'll probably be in an awkward position. A poke in the limbs or body can probably be handled -- but not your peepers!