The ds30 is a good one. I've got it to record some of my colladge classes. It seems to do the job. Of corse the ds40 ds50 would give you mor space but they would cost more. The ds30 through the ds50 are easy to use and easy to transfer from, that is if the ds40 and ds 50 have the same lay out. Are there more features that you are looking  for besides good sounding stario recording at a good price. I'm shure that there are other recorders with the easy of use and as good sounding as the DS30. I do have to say thow, the main reason I went with the ds30 was because of the voice guidance thing. good stario recordings was the icingn on the cake. All I was looking for, was a recorder that I could learn on my own and that would do the job well. I may have went over board.