The only devices I can think of with both decent quality and full-function stereo A/V are the Arcam SR250 you have and the Lyngdorf TDAI-3400 (rather than the TDAI-2700 you mention).
The Anthem STR does not have HDMI, so you would still have to solve the issue of stripping out the audio from the HDMI stream and handling lip sync issues. This is most readily done by having a TV with the necessary functionality built in, but your LG55EG910V doesn't (my TV does). The Oppo UDP-205 that I have can also be used to do this, and your UDP-203 seems to have the functionality you'd need (
OPPO Digital - Ultra HD Blu-ray Disc Players), albeit at a lower quality.
Given your other equpment, I'd therefore suggest the Arcam SR250 or Lyngdorf TDAI-3400 as your main options. Should you buy the Lyngdorf, your dealer will likely offer an in-home setup option (over here you get the service: it costs, but it's worth it). This will delegate the issues you had getting the TDAI-2700 to work properly to the dealer.