@bosiemoncrieff
I use a Emotiva ERC-3 CD Player / Transport ($499.00), it has a built in DAC (and amp section with RCA and XLR balanced out (true balanced-not sure) ) which I've experimented with into my HA-1, but it also outputs a digital stream as well with Toslink, Coax, and AES/EBU out. I generally use AES to Yggy, Coax to HA-1. 1 year old and no issues to date.
Tascam has a $499.00 unit with similar features and maybe some other versions as well for less. I think Reddog runs a Tascam.
Marantz has one but it's prolly around $1,000 plus, and NAD as well.
If AES is not a priority I think it will simplify your selection to coax and Toslink and maybe the cost as well.
If DSD is your thing the ERC-3 will not get it done for you, but as far as high bit rate stuff, well you've already got a PC hookup to use.