There's AKG's dual-driver hybrid K340, as muppetface has mentioned. It suffered from the same fate many AKG headphone lines suffered, which is endless tinkering with the sound profile and occasional burps in quality. I've heard a couple different units (not concurrently), and can say that when it's dialed in, it's quite nice.
People tend to buy Sextetts and K340s, hang onto them for a while, and then realize they don't actually use them much and sell them off. You can do better for the price, but you might also find it worth spending some time with one of the interesting side-paths of headphone history.