Your definition of transparency is obviously different from mine. I don't find even "good' codecs like AAC and Vorbis to be transparent until quite a bit higher than that - high enough that one might as well just use FLAC and be done with it.
HydrogenAudio also has nice info: http://wiki.hydrogenaud.io/index.php?title=ABX , there's also some reports of actual ABX tests being done (probably by people with "golden ears"), you can find on the HydrogenAudio forums (sorry I can't provide a link right now).
Plus (heh, I'm not even sure if you're reading this 11 days after, so I pinged you with an upvote to increase the odds :p) if you care about audio quality stuff and whether humans can hear it or not, highly recommend checking out this video: http://www.xiph.org/video/vid2.shtml the guy does a great presentation, it's an enjoyable watch IMO. it's about sampling rates, bit rates and dithering, so not really about lossy compression, but it's still useful background knowledge to have, also when reasoning about lossy.
