See my signature, I can get carried away!
You guys are both right, I need to retract the "100%". My intention was to point out that there are ways to buy a 99 cent song and then free it from DRM. Having said that, I'm not buying 99 cent songs or $8.91 albums to play on my home theater surround system. I agree that I can detect artifacts in pretty much the same range as you on the Pioneer/Bose setup. However, in the car stereo, or the Marantz/Sony in the garage the standard WMV sounds the same as the CD, I've tried it. When your intention is portability AND quality, I think that you have to agree the MSN Music combined with a CD burner and EAC gives you a lot more versatility (MP3 Player, CD player in car, boombox, etc., audio MP3 DVD, etc.) for it's size than anything that has come before (78, 45 and 33 Vinyl record, 8 track, cassette tape) with quality that far surpasses its predecessors.
Finally, I have to agree again: If MSN would offer the same music in a lossless (but slightly larger) file, Bill Gates could buy another island.