I have several systems in different rooms that I like to mess with. In one of them, I use the Sonnet Hermes network transport with the matching Sonnet Morpheus DAC. After trying all the connection types between them, including the I2S that Sonnet says is best, I have a strong preference for AES. It sounds more balanced and lifelike than the others.
I had been using a Clarus Crimson which was a solid cable. Tried a Kimber Orchid and that was pretty good, similar to the Crimson. Eventually got my hands on a rare Yamamura Millennium 5000 which I like more than the others so I'm using that now.
The Yamamura might be just a bit too warm though, so I just ordered a Veritas Nexum A to see how that compares. Veritas Cables is a new brand I discovered recently on the forums here. So far I am loving their speaker cables and want to try other models.
If I don't love the Veritas model I will probably try Audience and Jorma next. They both have interesting models in AES.