It depends how much you want to spend ! Zoom do a range , as do Tascom and Olympus ! I have an Olympus DS 30 that is VERY small and gives good "stereo" witha buikt in microphone - Tascam DR07 is a bit bigger and works well , also with built in Mic ! Both bought in USA for less than $100 .
Zoom 4 is a bit fiddly to operate , but the Zoom 1 has been lauded in here on other threads .