Thanks for the responses. I will probably end up leaning towards the Edirol as the MT II seems to be more problematic. I have been using an Iriver Ihp-140, which worked great, but I want something that doesn't cause extraneous noise when the disk starts spinning. It is mostly going to be used to record live concerts, rehearsals, lessons and for some playback.
Despite the fact it using AA batteries, is there at least an option to use wall current (e.g. a walwart)?