I cannot be without my numeric keypad. I use Finale 2009 for my music composition, and the keypad is central to input from the keyboard since you select note values and whatnot from it. So I will only use the USB keyboard. FWIW, it's the best keyboard I have ever used. Can't stand the deep travel of keys on other keyboards anymore.
As for the mouse, here's how I see it.
Mighty Mouse:
Pros: Side buttons, nice round shape, scroll ball feels more familiar to a lot of users.
Cons: Mainly the scroll ball gets dirty, but that's an easy fix. Still annoying.
Magic Mouse: (After one use, mind you)
Pros: No scroll ball to get dirty, very beautifully made, support for momentum scrolling.
Cons: A little too flat for my tastes (still comfortable though), no side buttons (yet; don't know if there are sensors that just aren't utilized yet), gestures will feel weird to anyone not used to a multi touch trackpad, wireless only.
As for the mouse, here's how I see it.
Mighty Mouse:
Pros: Side buttons, nice round shape, scroll ball feels more familiar to a lot of users.
Cons: Mainly the scroll ball gets dirty, but that's an easy fix. Still annoying.
Magic Mouse: (After one use, mind you)
Pros: No scroll ball to get dirty, very beautifully made, support for momentum scrolling.
Cons: A little too flat for my tastes (still comfortable though), no side buttons (yet; don't know if there are sensors that just aren't utilized yet), gestures will feel weird to anyone not used to a multi touch trackpad, wireless only.