You should have a DSi because of course, it has a camera. BUT it also has a sound recording system. And it has a SD card slot so you can download your favourite song and then make it high, low fast, slow, budgie voice and many more! And there are many mini games to the beat of the music.
And this is a VERY hidden extra. If you go on to pictochat and press where the pen icon is it will start flashing rainbow. Then you will have a rainbow line to draw with. Vice versa if you want normal black line again.
If you have accessible internet connection, You can shop at the Shop Nintendo.