I switched from Naim to Blue Circle. I had a 32.5/140/snaps setup that I wanted to upgrade. I started looking around to see what was available, though I had every intention of sticking with Naim. I literally stumbled over Blue Circle gear and was knocked out. It is hard stuff to beat, especially when you start comparing price points.
The Blue Circle will give you a little more timbral accuracy and slightly better imaging than Naim. Of the other gear you have mentioned your best bets would be Plinius or Ayre, but you'll have to spend more money on either of those to get a comparable sound to the Blue Circle (so why not spend the extra cash on better Blue Circle :).
Having said all that, I still have fond memories of my Naim stuff, and may eventually pick some up used for a small second system.
The Blue Circle will give you a little more timbral accuracy and slightly better imaging than Naim. Of the other gear you have mentioned your best bets would be Plinius or Ayre, but you'll have to spend more money on either of those to get a comparable sound to the Blue Circle (so why not spend the extra cash on better Blue Circle :).
Having said all that, I still have fond memories of my Naim stuff, and may eventually pick some up used for a small second system.