Yeah,
the MR-1000 is a DSD recorder. Supposedly a larger dynamic range than 24 bit. And a sampling rate of 192k x4 or something like that. The files end up being about 1GB for every 12.5 minutes for a stereo image. i.e. It's great at getting all of that detail of sound that you think that you're missing. It even keeps that detail when down sampled (or maintains the illusion of detail anyway). But the onboard preamps supposedly lack a little low end and other quirks that are fixed by a mod, or by using an external preamp. IMO my mics lack a little low end, whether that's the mics or the preamps has yet to be proven. I tried feeding it with a DMP3 on the front end, and there really wasn't much noticeable difference in results. I still liked the Korgs preamps slightly better though. As an MP3 player the Korg rules the roost. It really brings out the highs and lows that gets stomped on by low end gear.
You might try using a Samson
Zoom H4. It's much more affordable, and very respectable. And popular so you should be able to pick one up reasonable. And if you get something better, it should be fairly easy to offload. You could also try feeding the microtrack with a different preamp, say a DMP3. Lots of options to squeeze out every little bit of detail. If you have high hopes, you might not be quite satisfied until you have the best of the best in all dimensions. At which point it might be cheaper to rent studio time, than to actually buy the cow.