So, for example, in the present, Media-Monkey, Bryston DAC, 24/96 downloads, Laptop w/external HD, should completely kill the Transporter at a cost of just 300 or so more depending on details.
From a cost standpoint, yes, IF you already own the Bryston DAC. If not, that's an extra $2K for the DAC, which is the list for the Transporter which can be bought for several hundred less. Not sure why you are convinced it would "kill the Transporter", but I've never heard the Bryston. The Transporter also allows your music server/laptop part of your home network (wi-fi or ethernet), can stream to other locations on the network, and has internet radio & music services built-in.
The reviews on the Bryston are very impressive but that really does not answer your initial question. I still think that the elimination of the DAC is not a big cost saver and if you want all the functionality of the Transporter, you can always take a digital stream from its outputs.