over here (Holland), Janome Sew mini is considered as the sewing machine for kids. it's small, easy and it works very well. costs about 100 dollars.
I know a lot of women who have a very good sewing machine at home but bought themselves this one for on holiday!
it's easier available in the US by the way (there was some riot about it at first for the sewing machine dealers here didn't want it to get too well-known since they were scared that their more expensive machines would'nt sell anymore).
I would love to have the hello kitty machine !