The Wacom tablets use RF technology so you don't need batteries.
There really is no other brand if you are considering tablets.
The Graphire2 is very good for entry level work.
If you are using Photoshop7 or other high end graphics programs then get an Intuos2,
as there is more pressure sensitivity and it recognizes the tilt of the pen.
The tablet allows for custom mapping, absolute mapping, customized pressure settings, too much to list,
and my favorite- lifetime support.