It depends a bit on how much you use it and what you're planning to do with them. The Wacom Bamboo tablets are the best tablets for starting out. They're less expensive, and have lesser features than the other tablets, but are still very decent and fit for the average beginning artists. The Wacom Intuos are more expensive. They have more features and highter accuracy, but are imo only worth the money if you're drawing a lot with them.
No matter what you do, always go for Wacom. There are many other brands of tablets available, but I've never seen one match up against Wacom's quality.
I have a wacom intuos 4. It's my first tablet and I love it. <333 I have it for... 2 years? and It's still working fine. It's pressure sensitive, easy to use, and affordable (within the 100-200 dollar range). I use it with SAI and couldn't ask for anything better. XD I got it for Christmas too. We can be tablet buddies oh god //dies
I have a cheap 30 dollar tablet called Genius with a g-pen 560, if you are looking for cheap...(My older sister gave it to me, so I can't complain x3) However, if you want something good, I suggest wacom.