I purchased the Logitech keyboard a couple of days ago. It is model number Y-SAE71. It has extra keys on it to run the DVD drive on your computer. I like the positioning of the buttons. They are placed just right and my hands and wrists have not been sore since I began using this keyboard. It is black so it matches just about any desktop.
When I am typing the keys are not loud like my old board. They are fairly silent and do not make loud tapping sounds no matter how fast I type. The keyboard came with an installation disk to download onto the computer. This is to help set up the extra keys that are on the keyboard. I think this makes a great add on for people who type a lot.
The only setback to this was it did not come with thorough instructions as to what keys control what on the computer. So I had to learn by trial and error on my own!