I think that the most recent one is so cute, You're definitely have much potential and since youre so quick with things Im sure youll learn a lot fast. I agree a tablet will be very good for you, even if youre used to the mouse right now or it may take time to get used to using a tablet (I remember when I got my wacom intuos pro, I barely touched it for a whole year or so.) Wiith a tablet you'll learn and pick up on skills easier, be able to experiment more, and be able to draw stuff much quicker. It's definitely an investment that will be worth it in the long run, especially if you're wanting to be really intensive about your art, open commissions, or do something professionally related to it. Not to say that you can't do all that with a mouse, but it will be a lot easier on you, and what you would get done in a week with a mouse you could get done in a day or two with a tablet!
Also, I would be interested in doing a trade if you are~