The quality of many pocket voice recorders is excellent, and in many cases limited only by the fact that the microphones have to be small, close together and may not be terribly directional, so you may not get a full stereo image.

Even a mono device sold as a voice recorder will make a tolerable recording if you can set it to record in 16 bit .WAV or 256kbit (or higher) MP3 format.

I have an Edirol R-09 which performs very well, but since I bought that several years ago, Zoom have come out with the H2 and H1 which are much cheaper, and now there are competitive offerings from all the usual suspects including Tascam, Alesis, Olympus, Teac and Roland.

Most of these will make a good recording by themselves, and approach studio quality with external mics and preamps.