Hardware :: Keyboard With Or Without Numeric Keypad For IMac?

I'll be purchasing a new iMac soon and was curious to know your thoughts and opinions on the different keyboard options.

Option #1: Apple Wireless Keyboard
From Apple Site: For the ultimate in flexibility and to minimise cable clutter, choose the Apple Wireless Keyboard. Its ultra-compact size allows you to place your mouse comfortably next to your keyboard and fits on even the most crowded desk. It communicates with your Mac over a reliable, secure Bluetooth wireless connection. And advanced power management hardware and software extends the life of your AA batteries (included), giving you up to nine months of battery life (based on average usage patterns).

Option #2: Apple Keyboard
From Apple Site: The wired Apple Keyboard offers a compact design that lets you place your mouse comfortably next to your keyboard and fits on even the most crowded desk. Two USB 2.0 ports let you connect your mouse as well as a high-speed peripheral such as a digital camera or printer.

Option #3: Apple Keyboard w/ Numeric Keypad
From Apple Site: The wired Apple Keyboard with Numeric Keypad offers an extended layout that includes document navigation controls page up, page down, home and end and full-size arrow keys for playing games and scrolling through documents. Its numeric keypad is perfect for spreadsheets and finance applications. And two USB 2.0 ports let you connect your mouse as well as a high-speed peripheral such as a digital camera or printer.

So, what is the advantage to having a wireless keyboard for a desktop computer? If I'm planning on simply sitting at a desk in front of my computer, isn't a wireless keyboard somewhat pointless? The only advantage I can see is having less wires on your desk. Now, I'm intrigued by the other two keyboards because of the additional USB ports. Can anybody vouch for how necessary the numeric keypad is? Is the smaller keyboard a big advantage in terms of desk space?