Keyboards come in all shapes and sizes.  Keep in mind that you'll want to have a keyboard that is has a good feel to the keys when you type.  Whether you are a 2 finger hunt and peck type or a 120 mistakes a minute wonder.  Tryout the keyboard and if it doesn't feel right try another.

Also, make sure that you get yourself a carpal tunnel wrist pad or support for your keyboard.  It does make a difference if you spend much of your day typing.

Most keyboards range in priced between $9.00 and $50.00.  Some include fancy additions such as speakers, touch pads, track ball, etc.

If you buy a package deal at a computer super store or your local clone shop, make sure that you check out the keyboard.   Often, manufacturers supply cheep versions to keep the price down.