I just put in my order the other day for the HD6XX and Drop THX 789. I am not sure what DAC I should pair with them. I have read a bunch of the posts here and got some ideas but I still can't decide. Right now I was thinking of waiting for the Drop + Grace Balanced DAC or the SMSL SU-8 to drop again or even grabbing one of them off of Amazon. Would either of those be a good pairing or is there something better I should be getting? The only thing I don't like about the SU-8 is that it is silver. The SU-9 comes in black but it's more expensive. My only requirement is that I want it to be balanced. I would prefer something in the $200-300 range but would be willing to spend more if it's absolutely worth it and going to be a noticeable difference. Thanks!