Playing around with brightness, contrast or any other function is a breeze when you don't have to mess about with on-screen icons. And undoing things with a single button press certainly beats having to hit CTRL + Z. You can also use the number pad to open or save files.
Whichever keyboard you choose, you can get it in one of three colors: black, white, or metallic. You'll just need to wait around three weeks for delivery. But considering how much time you'll save in the long-run, that's a small price to pay. Besides, we hear that patience is a virtue.
Yours for $200 at Etsy.