The DigiOne comes with two power supplies (wall bricks). You don't NEED to get linear power supplies for it (unless you feel like spending lots of money). So $315 is the full price. I'll only be able to determine what sounds best once I've tried the DigiOne with the R-28. I haven't done so yet.
I do think this is what manufacturer said about their products
The Digione Signature needs 2 PSUs to run.
The player comes with 1 x 5V 3A PSU to feed the dirty side.
We strongly recommend you purchase the battery pack or use a very good power supply for the clean side.
If you want to use the Digione Signature right away, you can purchase an additional 5V PSU from us, but we dont recommend this set up.
Due to my experience the better power supply mean better sound though
Correct me if I wrong on this.
Please kindly tell that which set up and what budget when you compare both of them and which power supply you use also