I checked out the 598. It seems like a very good all around, entry headphone. I'm just concerned about whether or not it's worth the price. The q701 also seems like a warmer alternative to the k701/2, but I'm not sure how heavily amped it needs to be. I'm willing to get buy an amp/dac for it, if necessary, but I'd prefer not to have to do that. In a similar vein, would the 598's show any significant difference if amped?