The Bricasti indeed has excellent reviews, and I like the fact that they do upgrades at a reasonable cost. Hopefully, that would also be the case here in Britain. Coupled with an OK transport, it looks like a possible way to go. Even if the transport needs replacing or fixing once in a while, that would be affordable. Does a transport make a big difference to sound quality?
From what I read, the Esoteric players are solidly built (the K03x weighs 28 kg), and have an excellent DAC, as well a sufficiency of digital inputs. One would hope it would last for a very long time. It amounts to putting all the digital eggs in one basket though.