Best sounding op-amp

Well, I've 'rolled' the opamps in my headphone amplifier, and came to the following conclusion after a few days to a week with each one:

OPA2134 - flat and lacking soundstage, but decent overall since it didn't do anything wrong in particular, just failed to come through in those areas.
OPA2227 - similar, but warmer overall, slightly larger soundstage
OPA2604 - more detailed than either of the two but slightly cold sounding. Very wide soundstage though.
AD823 - punchy bass, but so detailed in the highs it sounds grainy. Constricted soundstage at times.
AD8066 - comparitively warm and lush, and not as detailed as the 823, but still very good. However had distortion when the input or volume as above a certain leve, like there was a 'step' in the volume knob - I don't think the voltage supply was correct. Upon going back to it the second time it let out a faint stream of smoke and was dead, maybe I plugged it in wrong though...
OPA627 - had to wire pair of these to work as a dual-channel, but by far the cleanest, richest sounding of them all, with the largest soundstage. Details are all there, but not offensive. It's staying.

Another one I may try: AD825.. and of course the AD8620 - I've heard some prefer it to the OP627.

Hi, I'm having Brice @ Sound Odyssey(phone717-846-6043 or e-mail ads on Audiogon) put the warm sounding AD825 op amps in my cdp(they just snap in)along with the (9) upgraded diodes, Cardas RCA's and damping sheet. He is very reasonably priced for the service and value minded. I'll update when I get the player back. Jerry

Op-amps do vary a lot in sound, particularly because of the power delivery on-die and on-package. Some parts are power starved from the get-go and need a lot of decoupling capacitance very close. Others are designed well for power delivery and need very little decoupling cap. These tend to be more dynamic and clean-sounding. OPA627 is my personal favorite. Packaging also has a big effect.

I'm currently using AD8620 on my Marantz 67SE and love it.
I also upgraded the clock board too.
After done much research, I found the AD8620 has the best spec.

Thanks for everyone's input... I'm leaning towards trying out the AD8620... does anyone know the difference between the AD8620-AR and AD8620-BR? The BR version is about double the price.

thanks.