High Quality Universal Player??

If you're going to use this machine to watch movies, then the CA blue ray players or Oppo will be just fine. If you have a lot of SACD then I'd look at Marantz. Can't speak on the Oppo 105d, but I think the CA 751 is probably close. I can tell you if you're primarily listening to red book cd's, a CA 851C is far better than the CA blue ray machines.  As far as your CAL goes, any of the machines you noted will be better. CAL's were very nice machines in their days and still good today, but not up to these machines. If you have a lot of SACD's don't overlook Marantz.

i would say Oppo 103 or 105, or even 105D (Darbee processor) if you want better video images

I own the CA 751BD and IMO, it is a wonderful player.  Well built, nice interface, fast loading, so far very reliable.  The newer 752 is pretty close to the same as the 751 but it can also be used as an outboard DAC.

Of course you could also go with an Oppo 105.

Bill

In my experience, until now the Oppo would have been my first choice. Straight out of the box, no mods. Also my experience, Arcam has bested Cambridge in sound quality. I have heard several players and DAC's.(even though at one time they both used Wolfson DACS)

Here are a few quotes I have found on line regarding Arcams universal player UDP411.

"...In fact, it’s worth mentioning here that the OPPO BDP-105D, the UDP411’s closest competitor, offers a decent range of smart functionality (Netflix, BBC iPlayer, YouTube), dual HDMI ports, multichannel outputs and DVD-Audio playback for around £100 less than the Arcam..."
"...We had a OPPO BDP-105D on test at the same time as the Arcam and were able to do a straight comparison. There isn’t a great deal between them – these are clearly two audiophile decks operating at the top of their game – but we preferred the Arcam’s slightly smoother and more insightful presentation..."

I personally would audition each unit. It's the only way to be sure. 

N