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OPAMP tests 270 ohms

A friend was modifying a cheap headphone amp, and was wondering which OPAMP would work the best.
So I created a similar circuit and measured several different OPAMPS loaded with 270 ohms as a 'typical' headphone load.
Note: Don't only look at the headline THD figure - also note the harmonic distortion even for some that measured well.
Measurement parameters:
PSU: 15 - 0 - 15
Gain: 2.2
Output: 2.7V RMS
Load: 270 ohms
The various results are pictured below (click on an image to enlarge)
OPAMPTHDNotes
LM4562NA0.00027%
NE5532N0.00160% (Philips)
NE5532N0.00141% (Signetics)
NE5532N0.00090% (Texas)
NJM2043DD0.00101%
NJM2068DD0.00090%
NJM4558D0.00604%
NJM4565DD0.00502%
NJM4580DD0.00082%
OPA2134P0.02294%
OPA2604AU0.00132%(sample #1)
OPA2604AU0.00139%(sample #2)

Click the images for a larger view

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