I had been looking for a player for quite some time and finally decided on the Diamond Rio 500. I was glad I did. It has internal memory and you can buy external flash memory.
The player is a great looker. It is smaller than a traditional audio cassete, light and easy to use with nicely laid out buttons.
The supplied software is also easy to use and newer versions are available via their website when you register.
The only thing I can say is wrong with this player is if you leave a battery in, even though the player is off, it will flatten it. Apart from this I am very happy with this product and would recommend this to anyone looking for a MP3 player.