I too need to buy a BT keyboard. As has been said, there are many good ones. But also many bad ones!
Here's a commercial site to set off your hunt...
nexus10keyboard.com
I'm puzzled that I rarely hear of BT mouses for N10. My Windows machine uses a wireless keyboard AND mouse for almost the same price as a keyboard alone. I don't see why anyone would not get a mouse as well. Perhaps its because of the touch screen? I'm wondering if there's a little hassle using a BT keyboard at the same time as a mouse.
Consider not buying a keyboard-case combo, in case you choose to use the keyboard and/or mouse with your RAZR Maxx.
I find many things will not work in my browser via touch, for example the window-size handle on the bottom right of this teeny weeny text input box- it refuses to recognise my touching it to drag a bigger box. I wonder if for some reason they would work with a mouse.