If you can afford the price, and loss of convinience due to using tape, I have to recommend DAT over minidisc. It is a pure, non-compressed sound, and gives you way more ba-ba-boom out of the mic you use. I'm pretty picky about the sound in recordings, and to my ear there is a major difference in depth of sound between mini and DAT. Sony has a few nice portables. Audio-Technica has a stereo mic that is a fantastic value at less than $400. My buddies at
www.sweetwater.com have all these goodies w/o tax and shipping.
If you do digital audio on your computer, the audio can be easily imported from either a minidisc or DAT and manipulated in any way imaginable. You need an audio interface and audio production software to do this, but well worth it! Dead and stuffy sounding practice room recordings can be changed to an old church or a famous Hollywood recording studio with a click of the mouse. It also makes it cheap and easy to store recordings for all time by putting them on a digital disc. I recommend Logic for MAC. It is the easiest to learn and the most powerful. PC's should not be used for music, but if you have to, Cubase seems to be the one people use.
I know that's going way beyond your question, but I just love ranting on tech stuff.
*Interesting fact*
I have the best samples available today in my virtual orchestra that I use to score my pictures with. The Vienna Symphonic Library is the most realistic one ever. The tuba samples on it suck, and so have all other tuba samples I have tried. I still add live tuba to all my arrangements that are recorded on the computer. My fellow film and TV composers have the same observation. The tuba isn't an easy instrument to record, especially any kind of "generic" sound. In my opinion the "personality" of sound tuba players produce is greater than any other wind instrument. We are the biggest and the best! And the toughest to record.
Play it low. Play it mellow.
MSM