Check with music direct. I believe you get $1000 off each for each transport and each DAC you trade in toward $1000 off each Dac and each Transport you buy.
The PWT is a CD player with memory, so it plays from the memory. It stores a couple minutes of CD quality music or several seconds of hi-rez audio before it outputs it. The PWT plays hi-rez disc as well as CD's. It does NOT play SACD's. I'm not sure if it will play DVD-A or not.
One computer is fine if you want to use it for a source. You can play anything from low rez to ultra hi rez using the computer. I play ripped DVD-A's this way. You can hook it up to the DAC via Coax, Toslink, or USB. When the Bridge is released you can hook it up wired or wirelessly through a router. This will be the best way.
This is a STELLAR combo IMO.