Flash-based MP3 player with specified frequency respon

I'm looking into buying a flash-memory based MP3 player. I'm trying to get a quality player that has linear audio output. I am usually listening to Baroque music, both from CDs and from my own recordings. Here are my detailed requirements:
- USB 2.0 hi-speed
- flash memory
- powered by standard batteries (AAA or AA)
- specified frequency response, S/N ratio and THD
For example, on the Zen Nano Plus specifications web page, I read
- Signal to Noise Ratio: up to 90dB
- Frequency Response: 20Hz to 20kHz
- Harmonic Response Output: 0.%
This appears quite weasel-wordy. For example, a S/N ratio of "up to" something says nothing ("I am up to 00 years old"), reasonable wording would be "S/N ratio of at least x dB". The frequency response does not specify the attenuation over the given frequency range, -30dB at 20Hz would not be ruled out. I prefer frequency response charts that show the function "attenuation (dB) over frequency on log scale". For example, those are readily available for many headphones and all reasonable microphones. Further, I can only guess that "Harmonic Response output" means THD. Moreover, there is no data for stereo separation/crosstalk.
Since these data points relate to the headphones output of the MP3 player, measuring them is fairly easy, since no actual sound waves are produced.
Has anyone measured any of the Creative flash products and can post the respecti've charts and data?

Thank you for your answers.
Yes, I'm technically minded (I'm German, in case you think that explains it :-) I just posted hoping for the off-chance that someone was curious enough to have performed some real measurements.
The idea for generating the WAV file would be NOT to try to record a real oscillator, but instead create the WAV file with a PC audio editor where you can say "give me a kHz tone for 0 seconds". You would do this on a log scale from, say 20 Hz to 20 kHz, save as WAV, move the resulting file to the MP3 player, play it, and check the output levels for each frequency. Calculating THD is probably more ambitious, but if your 'scope shows some frequency skew, that would probably be interesting, too. I don't know whether a traditional 'scope has enough amplitude resolution to deal with 90 dB S/N ratio (that's a factor of 30000 between signal and noise floor).
I don't think I can attach files

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