You're welcome Graham, it was fun going through all those. I need to write them all down for future reference anyway so this post will be handy for me too
I had most of yesterday to play with the DACport. It's not quite the step up I was hoping for from the Fiio E7+E9 together but recently I noticed the E9 actually does quite a good job in the combo. The E9 is wall powered so the fact that the DACport can best it with USB power is great and for me the full size headphone jack (compared to the E7 alone) is great for the Denons.
Just a quick first impression from my Fiio upgrade (CEntrance DACport): The bass seems to have a little less impact but tighter detail (more texture on the low end). The sound stage is nicer (wider), the mids more exciting and the treble more controled but all of this was pretty slight to my ears - so far. Also it seemed to have a more noticable effect on my lower end Sennheiser HD25-1 II compared to the Denon AH-D7000. Perhaps it's just me but it took me quite a while to get used to the differences of the Fiio, after a while however I could not live without it so for now I will reserve too much judgement and just concentrate on putting more listening hours in to the DACport.
Oh btw the latest WHF mag has a review of another DAC/amp called a 'CYP AU-D160' which is £135 which I have never heard of before. These reviews generally don't make it on to the website for a few weeks so I am probably not allowed to tell you how it did in here.