The OPA2107's are out of this world. Biggest soundstage I've heard so far without compromising detail, clarity, and most of all punch. There seems to be an improvement in bass as well. Wow, truly truly stunning! Like the LM833N it has warmth and is very immersive. Favorite so far!
I thought you would like that one. Also a really nice one is the Analog Devices AD746JNZ. You will not be disappointed.