Thanks for the responses. I am looking for the highest quality I can justify. I wouldn't want the Sonos. I was drawn to the Transporter SE, with its Aes/ebu digital out, but I don't understand the Nas situation with squeezebox and the Transporter. Seems like you need a pc to get the system to work ?
I found this, which looked promising. But they seem to be out of commission or no longer in business.
http://www.auraliti.com/L1000.html
Then there is this. Which seems perfect.
http://www.aurender.com/entCA.html
But they openly admit that the nas connection is compromise. Also, several would be pretty steep.
It seems the manufacturers that offer a streaming only product (so no D/A function) are the manufacturers that believe pulling data reduces the sound quality. Bryston makes something that would be perfect, but it won't pull from a NAS and soon Lessloss will make similar sd card player... I would note the guy Auraliti designed Brystons player!
Then you have manufacturers such as Naim, Meridian and Linn that swear by the NAS access platform, but won't produce a streaming product, but insist in including their d/a process internally, with an optional coaxial bypass...
I will assume I am in the distinct minority, but I would prefer my own separate DAC, as technology changes...