Weiss DAC2 or W4S or PWD or Zodiac + or . . .

I'm currently using a Benchmark DAC1 USB fed from fanless, SSD equipped Windows box on a wired network. Playback software is *cringe* iTunes. Music is on a Netgear Ready NAS NV+ in aiff format (but will probably start re-ripping w/DBPoweramp). I'm also playing around with a Cullen Circuits modified Sonos feeding the Benchmark via S/PDIF. I'm using a Crimson 710 pre into Crimson 640E monobloc amps feeding Sonus Faber Cremona Auditor speakers although I may be upgrading those as well.

If I end up with the Weiss I'll probably get a Mac Mini and run something like Amarra. If I go with the PWD I'll try the Bridge. Otherwise I might stick with the PC and try JRiver or something.

So how around it? One of these or something else?