This is a tough one to recommend from a common sense standpoint and so you have to go with it based on other logic. Very rarely does something at this level that costs more than twice as much perform more than 2x better and that applies for the monobloc but the difference is indeed significant and I know of no other way to reach this level. If this isn't end game, I don't know what is. There are probably other equally good DACs from the likes of Nagra, MSB, Light Harmonic, etc. but most are more expensive than the monoblocs and at this level, the differences would probably amount to splitting hairs. The Nagra is of specific interest because it is priced comparably to the monobloc but as a tube DAC with a high output impedance, you cannot connect your headphone directly to the output signal. I have found myself especially attracted to products if there is good rapport with the product's designer and I am impressed by how responsive Vincent Brient has been. We have exchanged several dozen e-mails over the past year and he has patiently answered every question I have had despite not knowing if I was a serious customer or not. Having scoured the internet on all things related to TotalDac or Vincent Brient, I have yet to read anything less than exemplary about either. I am also equally impressed by my dealings with Scott Berry, creator of the CAD 1543 and CAT server. If his CAD 1543 DAC had a more ideal output impedance, I would have given it a shot. I am keeping an open mind but I won't be surprised if his CAT server turns out to be the best of the lot. Having read his efforts to create this machine over the past several years and knowing his extremely high attention to the smallest of details, my expectations are very high. You are in a favorable position living in England. You could easily make a trip to visit CAD and TotalDac and audition these systems for yourself without making a purchase first.