Not to repeat what others have said but the Mamba is a nice bow already. However, I certainly can understand the "itch" to get something new. It's a common problem in this hobby of ours and it can become very addictive!
Now as others have said, get your proper draw length first. Then get some good arrows to match your current bow and start shooting it first. Then, go to some shoots and/or some shows and start shooting as many different bows as you can. Believe me, you will definately know when you have shot the right bow for you. (It's like meeting your dream girl. She make look great to you, but she might not feel just right. When the right one comes along, you will know it. It might not look the same as you imagined, but you will just mesh together!) Then make sure you buy it. Why? Because no two bows feel exactly the same even when it it made by the same maker, same specs. etc. (in my opinion). Caution: You may find that there is more than just one!