I'm still running my A400 after 20 years of reliable service, I agree with some of the comments here... It has long since been outclassed and the phono stage is harsh and dreadful but with the right source it can be quite lovely. Over the years I've used it with a variety of sources and speakers including Pioneer PDS, Marantz and Technics CD players, a couple of dacs, Mission 760s, Ruark Talismans and most recently a pair of Celestion Ditton 15s which seemed to work very well with it.
Yes it has its critics but as my first proper amp it has been a real workhorse and seen more parties than I can remember. I've heard that with a good recap and some attention it can still outperform integrateds in the sub £1000 bracket, Jac Hawk on here was a good source of info about this. Myself I've never gone this route thinking the £250 this would require would be put towards a more recent Rega, Marantz, Arcam or Naim. I find the headphone output to be quite nice driving my 400ohm Beyerdynamic DT100.
I recently put the A400 up against my amptastic mini t and found there wasnt much in it, but kept the A400 going as it just sounded so much better with the dittons. The mini t will be its replacement if the A400 ever gives up the ghost.
Like some others here I've been a bit surprised by your choices Shane, especially given some of the gear you've sold on recently but I do know what its like when you find something which just works with your other gear, hence my recent decision to go all Rega for my main system.