iPad keyboards is unique in that with the exception of one, they all have been used by me. I own all of them, except two that were supplied for evaluation by the manufacturer. I have used all but one of these keyboards extensively in my work, and I have a good feel for which ones are best for me.
the Logitech Ultrathin Keyboard Cover is a combination cover, stand, and keyboard. It only protects the front of your iPad when the cover is attached, but it connects like a Smart Cover and when you're ready to use, you can take it off, prop your iPad up in it, and work on the Bluetooth keyboard without adding much thickness to the base at al