Almost every tablet does not have a screen. I have used a tablet for 4 years and I love it; I hardly do traditional work anymore. You will learn to use it with skill just like traditional drawing in about three weeks of using it, and then your skill will only go up from there. I was concerned about being able to learn though it's actually very easy.
If you're looking for a durable, sleek little tablet to just start out with, go with Bamboo Fun. I started out with this one for about two years, it's an extremely good one to start out with. It's the cheapest, the smallest one being about $100.
If you're looking for a sturdy, professional, more touch-sensitive and efficient one go with Wacom Intuos3. I upgraded from a Bamboo to this about 2 years ago. It's not harder to use but it's a considerable difference and I LOVE mine. You can't buy Intuos3 from Wacom anymore because they are discontinued, though you can buy them used(which is what I did). You should be able to get one for about $230.
If you REALLY want something fancy, Wacom Intuos4 just came out. I haven't used it but it's got some pretty fancy gadgets and stuff. Personally, I think it's unnecessarily fancy, but to each his own I guess. These range from $350-$400.
The three I listed are the most popular of tablets, ranging in price and professionality.
Make your decision with confidence that you will enjoy using it; I promise you will learn quickly and it's a very fun and useful tool for those who love to draw.