Nugen,
I own the Nomad Jukebox and the Sony MZR900. Before I purchased I did some research for the reasons MacDEF explained. Figure out what you want/need in your portable. Once you narrow your choices down, if you can demo, demo, demo. If you can't, it's a shot in the dark especially if you're buying off the web. I've seen the 900 for $350-$400. I shopped around and I paid $271, including shipping for my new 900.
These are my impression of the Nomad:
Looks like a PCDP, though slightly heavier. Same control features as a CD (skip, ff, rew, program, random disc, random programming, etc). Proprietary software is upgradeable and easy to use. 6 gig hard drive = lotsa music even if you rip at 320. No need to carry extra discs or MDs. 2 line outs/1 line in/1 headphone out. USB port for easy connection to your Mac/PC. Battery life is suspect. Sound is very good, though I do not rip mp3s, just CDs. It comes pre-loaded with some good music, some really bad music and 2 books! You can erase these, of course. There is a lag time when you enter a function (ie next track) of about 2-3 seconds. Has not skipped on me yet. I do not like Creative Labs version of DSP (called EAX). Overall I love this unit!
However, if its more portablilty (less weight even with a few MDs) you may want MD. The 900 was Sony's top-of-the line, the 909 just came out in Japan. Very small, even smaller buttons. Flawless ant-skip/G-protection. MDLP (on LP2 you can fit 2 albums on a 80 minute md with very slight degradation). You can control recording level, though not on the fly. Optical in. Combo headphone/line out. Synchro rec with my Sony CDP is a breeze. Jog dial should have been a wheel. Pre-recorded MDs are equal to pre-recorded CDs in sound quality. Build quality is excellent, ergonomics are good, button are just too small. I love this unit as well.
If you need a very in-depth comparison of Sharp's and Sony's high-end portable MD recorders check out this link:
http://www.minidisc.org/brian_youn/sharp_mt77.html
Bottom line I made very informed choices. I hope this helps.
Regards - reynman