I think eventaully after my short list become a long list and then a longer list....I decided to pop to local dealer and actually make some decisions.....I eventually did that, although it was supposed to be a weeks audition, but I like it that much its done and dusted.
I doubt I will use the pre out as I already have Arcam A85 and Arcam P85, so doubt I will benefit. The USB may get used in the future, when I understand all that stuff 🙂
Good luck with the Fid Audio too, as that was on my long and extra long list too 🙂
So in the end it was worth looking for a headphone amp , but I have had to spend £499 to get the sort of scale of improvement I was looking for. The £100 amp I actually thought sounded worse than my A85 headphone socket.
Looking forward to see if the M1 HPA gets better over the next week or so as that would be a real bonus.
Should I have spent more on my headphones I now wonder 🙂