If I had a bifrost I would probably put the money towards something else for now. There seems to be a new Dac every other day. The return on investment is less and somewhere down the road, you can upgrade the bifrost anyway. As good as the concero is, we were listening to a Taboo LCD3 system with a $99 modi right next to it (thanks Jazzerdave!) , and the difference is not a "throw-away" difference in my short experience. The Concero was simply to my tastes in very limited experience a bit better all the way around. I would rather trust Jazzerdave and Nick who have vastly more experience. I haven't compared anything to the bifrost, but if that's what you have, save the money and buy some nice tubes for rolling!!!! Wait around a bit and see what others determine to be a great pairing and buy on recommendation. That way you don't go broke trying 15 different Dacs to find the one that works best.
Or you could order 15 DACs and do all the research for me so I will know which one to buy