You can't really go wrong with either the iAudio or iRiver, but the 700 series is a little bit outdated now. Benefit is that the price is dropping - I saw the 1GB for about $290 at mp4store website. Don't know if the iAudio comes with an armband though.
I've been researching flash-based MP3 players for MONTHS, and I think I've got it narrowed down to the iRiver iFP 799 and the Cowon iAudio 5. Here are my needs:
--flash-based (use for running, the gym)
--around 1 GB
--ARMBAND!!!--at least available, if not included
--FM radio a plus
--available around $150 or so
Can anyone make any recommendations between these two or any others out there? Thanks!