You might be able to get a list from asking the question on head-fi forums,Make sure you keep your wallet bolted down. When you go there.
Objective complete....Op-Amps OPA2227.....AD712 & JRC4556 have been added to my inventory.......and it only cost me an extra $60 for the trip to Head-Fi,,,,as I also snagged a pair of Grado SR60i :cheers: Note to self.....Bolt wallet down better when visiting there next time
I live on head-fi a good chunk of my time and you should heed the warning GC gave you. I just ordered my WA7 last month and I'm trying to hold out for the closed Audezes to come out instead of getting some Fostex. It's really difficult to tell myself no constantly.