Need mp3 player suggestions

[Freakin]

Requrirements

Small (reg ipod size or smaller)
At least 5-6 hours of battery life
Record from *EXTERNAL UNPOWERED MIC*
Able to record at least 4-5 hours of speech

An iRiver is currently filling most of these needs, but the thing is a huge brick. I want something smaller. Any suggestions would be appreciated.

I know there have been numerous mp3 player threads here, but i don't think a single one has dealt with unpowered external mics...

Freakin