Although I am a huge fan of MiniDisc (espescially the newer Hi-MD recorders), the future of MiniDisc is bleak at best. You'd probably to best to look into a flash-based recorder. I don't know much about what's available now in that respect though.
I know there are plenty of MiniDisc haters (with good reason mostly), but the format has been around for ~15 years or so and has grown a lot in that time. It certainly has it's uses, but when all is said and done and the units are no longer being manufactured, you may get stuck with discs you cannot get anything from.
Like I said I'm a huge fan of the format, and use it extensively. If you had asked this question a few years ago I would wholeheartedly recommend it.
If you have any specific questions regarding the format, hop on over to the minidisc community forums
http://forums.minidisc.org/ a friendly community that I have been a member of for 5 or so years now. We'll gladly help answer any questions you have.