I'm using the HD800 with the v200 and v800 dac. This combo is very good. I wouldn't call it smooth as it is very detailed imo. But I'd like to hear the HDVA600 + v800 pair as well. Perhaps this combo is even more detailed with wider soundstage. Also I have not heard the v200 on any other source, but from what I heard the v200 really shines with the v800 dac.
I'm waiting to get the first impressions on the new v281 HPA. Excited about the balanced output and how it compares to the single end output of the v200. Basically the overall improvements to the v200.
My other headphone is the hd 580. It's used mostly at the office. I wouldn't dare to bring the hd800 to the office in my backpack.