My new rankings for my now trimmed down portable list:
1. Sony D-14
2. Sony MZ-S1
3. RCA K@zoo
I really only use the MZ-S1 outside of the house, the D-14 is impractical as a portable, and the K@zoo is a 32MB MP3 player (do I really need to elaborate

). I relistened to the K@zoo a few weeks ago and realized I was overly harsh on it when I ranked it since it has the absolute best sounding 64Kbps MP3 playback I've heard which means it doesn't sound good, but not like total crap either. Considering it's use it is actually pretty decent sounding. I just got my D-14 today and have had it out of the box for less than an hour, but I am thoroughly impressed by it. I don't have an RCA to mini cable to hook it to my headphone amp so I am listening through the headphone amp. I didn't think it was possible to enjoy the Beyer DT770 Pro's a whole lot without an amp, but the headphone amp on the D-14 is incredible. I have it in between minimum and 2 and it is as loud as I need.