The MS X6 lets you move the numpad to the other side of the keyboard (or possibly leave it detached, but for mouse access those are equivalent options). I don'

The MS X6 lets you move the numpad to the other side of the keyboard (or possibly leave it detached, but for mouse access those are equivalent options). I don't have one, and it's reviewed less favorably than the X4 which doesn't have the removable keypad, but it's something.