If you are talking about handheld MP3 players then I haven't heard of the ones you have mentioned.
However, I have a Diamond Rio MP3 player which is very good. Its about 2 years old now but still works without problem. Its smaller than your avarage 'cigi box' and runs on a AA battery for hours.
Only complaint I have is it comes with 32mb ram standard, which isn't much really, but it does the job.
What you want is about 256mb of ram, so that you can hold about 10 CD's (depending on the bit rate of course.
Anyways, hope this was of some sort of help.
