Is there any Streamer/DAC/Preamp good enough to replace a dedicated standalone preamp?

I am getting into digital music server, considering a streamer/DAC/preamp unit like the the Brooklyn Bridge or Teac NT-505.    Has anyone compared its Preamp section against a good dedicated preamp?   I currently have the Conrad Johnson ACT2 and see if I can eliminate a component/cable in the chain without much sacrifice in sound quality.