I have Eclipse versions of the Calypso and Atlas stereo amp. I cannot compare with the Bricasti, but can compare Calypso base model with the Eclipse version which I had done last summer. Presumably the difference with the Pandora would be comparable. I feel the Eclipse upgrade is a lot better and worth the money, but again do not know how it compares with the Bricasti. It's really a different level SQ than the base model. Based on this experience, I'd also recommend upgrading your Atlas to Eclipse, although since I bought it at Eclipse level I cannot compare before and after.
As it happens, I also bought an Antipodes DX and recently had it upgraded to Gen3. I like its sound better than the Aurender base model it replaced, but that is to be expected at nearly three times the price--I did like the Aurender. My impression--not based on direct comparison, except for the Aurender--is that the DX is among the higher performing streamer/renderer/rippers, and the convenience of its internal storage (I got 2TB, and it is SSD) is appealing. As you probably know, it does not contain a DAC. It's also Roon Ready. I will say the Antipodes customer service is excellent. Good luck with your explorations.
Jim Heckman (Pennsylvania, USA)