For most bottom conditions, your Bruce type should work for a starter, but I would go to a larger size....say around 11 pounds with a short piece of 1/4" chain and 150' of 3/8 nylon rode.
Not exactly true...It's less about the weight of the anchor and more about the system. Never use a SHORT piece of chain. Use one that is properly sized for the load of the boat you are anchoring. Any good book on anchoring will tell you how to calculate the loads. And, 3/8 is way too stiff for such a small boat. The goal is for the rode/chain combination to keep the anchor grounded. Smaller rode (within reason) is always better as it will give and take without lifting the chain then the anchor etc. Anchoring is a lost art that's worth learning. Even a bad anchor will do amazing feats give the proper chain/rode and placed at the proper scope. You can get the best anchor money can buy, but without correct deployment it's worthless. Take the time to go to the library and get a book or two. It's as important as knowing how to sail the boat. For what it's worth I used the 4 lb. Bruce for a number of years with a nice length of chain and lots of scope. Used properly it's all the anchor you will ever need. An 11 lb. Bruce on such a small boat is way overkill. Take the difference in cost and invest in a good chain and rode.