We are thinking about a Christmas gift for my 4 year old sister. She wants a device to listen to music. I think she might also like to be able to play games and watch youtube videos. Would a used ipod touch be too much for her? We are getting her 6 year old brother a DSi/DSi xl. Is there any difference between ipod touch 2nd gen, 3rd gen or 4th gen? does it matter? Thanks!