The EXR7s is far superior to the EXR5s:

1. A floppy drive
2. Dedicated/lighted buttons for styles and sound banks
3. 76 notes
4. Nicer keybed
5. More sounds/styles
6. Better speaker system

Do yourself a favor and play the 7s.

I had the Korg PA50 and I'm going back to the EXR7s. I like the piano, styles, 76 keys, USB and keybed much better. I can't help it that I'm a Roland fan. Just my $.02