Seeks pocket digital recorder for lectures

I have looked at a number of mp3 recorders ( a few do WMA). In general, I was disappointed with the recordedf sound capability, though Olympus did a reasonable job with live music (at a concert; it has stereo microphones). Most have poor speakers, so ear piece is the way to go. None have 1 GB capacity; most have about 256 - 512 Mb only. I think there is one (a Sony?) or other Olympus model that allow you to add a micro SD card, but I think you can forget 1 GB. Why do you need 1 GB? You can get up to 70 hours at a slow recording rate with ~ 256 MB.