Owner of a UMC200! Its a great unit and also appealing as can be to look at!!
There's a new firmware update that I notice is available at Emotiva and hear it fixes some bugs that some are experiencing. However in my case no issues and works great!! Since you are an owner of the Emotiva amp, the UMC200 would be a great match, but if that does not matter to you I am sure the other choices will work out fine also.
As for the Oppo 103 as I own one too, I just use it as a BR player and running an HDMI cable from the oppo to the UMC200 (nothing fancy), but works great together.
There's a new firmware update that I notice is available at Emotiva and hear it fixes some bugs that some are experiencing. However in my case no issues and works great!! Since you are an owner of the Emotiva amp, the UMC200 would be a great match, but if that does not matter to you I am sure the other choices will work out fine also.
As for the Oppo 103 as I own one too, I just use it as a BR player and running an HDMI cable from the oppo to the UMC200 (nothing fancy), but works great together.