Compact Flash audio recorders

["Colin Trainor" col_trainor]

Hi all,

I want to upgrade from a Sony Professional cassette recorder to
something lighter, which can record up to 10 hrs or more, and with
long battery life (preferably AA).

I have a Sennheiser ME mic.

I'm currently thinking of buying a Sony PCM-D50, but there are also
many models such as:  Olympus LS-10 and M-Audio MicroTrack II -
Professional 2-Channel Mobile Digital Recorder

Does anyone have comments on the use of these recorders for recording
birds in forest.

thanks,

Colin Trainor