Opamp rollers and fiddlers this is for you.

[georgehifi]

Warning: this is a large download 35meg on proper opamp measurements, and it's conducted without any voodoo involved.
http://www.sg-acoustics.ch/analogue_audio/ic_opamps/pdf/opamp_distortion.pdf

This seems to me after a quick look to be the pick of the bunch, expensive at $50
http://www.johnhardyco.com/990OpAmpDetails.html


Knock yourselves out, Cheers George

 

[qusp]

yeah well the schematic for the JE990 and other variants of high performance discrete opamps are being published and digested right here

heres the latest JE990 schematic

and Scott Wurcers SW-OPA which people are starting to breadboard.