There's no wireless WITH the numeric pad (I'm guessing you meant without). I was concerned, since I'm used to entering numbers on the 10-key number pad. I told them at the store that I wanted the wired keyboard with number pad and they gave me BOTH! I'm using the wireless right now to give it a chance, but I think I'll switch to the wired one soon.
The biggest wireless benefit is the small size, so the mouse is closer. I've used a mouse next to a wide keyboard for a long time, though, and it's not a problem. The extra wire isn't that big of a deal for me, and there's also a bonus of 2 USB ports on the wired keyboard. They're a bit lame in that they're recessed into the sides, but they're still better than none on a keyboard.