HI Keebo,
I can echo what some of the others have said about Casio. I used only Yamaha & Roland keyboards during my playing days, so when I spotted a Casio I thought of the $99.00 kid's toys you found in department stores. How wrong I was. I've had my WK1800 for over ten years and am very happy with it. It has the battery option, and inbuilt speakers,and synth, but with 76 keys it's probably a bit bigger than you require.
But you should make a point of having a look at some of their other models.


Cheers,
Keith