If you are looking for an audio player get the H140. You dont need a colour screen to listen to music, well i dont...
PMP are totally different. If you are looking for a player to view pictures and films get a PMP. Although the size of PMPs are quite large as you will know.
I think nowadays you need to take Rockbox into consideration, as it adds so much more functionality to your player. They are just about ready for releasing it for the iriver although there are builds you can use. The ipod port will be available in November apparently.