Summary: I need a voice recorder built in radio. There are three optional ones in amazon, SONY,icd-ux523/f($156), and Olympus ws-710m(%99), WS-803($120). Sony ux523f is too expensive,and it has only 4G memory.My friend has a ux523G without radio whose price is only half of ux523F. When I turn to Olympus, I didn't find any great difference between 710M and 803 except that the recording time of WS-803 is longer than 710M. However, this is not important for me.