Ron...
The biggest improvement going from the 2K to the 3K is the USB flash drive. No more floppies. There are some other advantages as well...but being able to store EVERYTHING on a thumbdrive for immediate access is number one IMO.

The S910 takes things a step further with its ability to record and play MP3s. With each new model there are also new voices and styles. It sounds like the S910 sould be the next logical step for you.

Eddie