I've managed to go through a bunch of keyboards over the years, from straight to ergonomic, but the one thing I've always looked for is one with a good numeric keypad. I'm a number cruncher, by trade, and when you are accustomed to using a 10-key adding machine (calculator to the younger generation), it's hard to adapt to a laptop keyboard or the new Apple Bluetooth keyboard. I've had my original Apple Bluetooth keyboard for 7 years, and it's finally starting to have occasional sticking problems. I have one of the new compact keyboards that came with my current iMac, but, while it's okay to use with my iPad, the lack of numeric keypad stopped me from using it full time.
After looking at a bunch of keyboards, wired and wireless, I decided to go with Apple's wired Keyboard with Numeric Keypad. At $49.00, it's a bargain. Yes, it needs to be plugged into the computer, but there is no hassle with batteries dying at 1:00 AM while I'm trying to beat a deadline. It feels smaller than the old one, but it's the same width and length, just not as tall. The feel is great, with just enough tactile feedback. Additionally, it gives you a USB 2 port at each end.
My only gripe — packaging! Now, the box it comes in is nice and compact, with no wasted space and no plastic finger cutters to clutter the landfills. The shipping box? It was big enough to hold at least a dozen of them, with around 24 feet of brown wrapping paper crunched up to cushion it. I hope it was just someone new in the shipping department who didn't know better. Still, it's a good keyboard at a very good price, and if you are looking, it's one to consider.