The Sony would be cheaper, bigger box, and bulb replacements. A plasma is really nice. LCD is expensive but nice as well. I’m a little frugal so I’d go with the Sony, but if I didn’t mind the added expense I’d go for the plasma.
Those receivers will all be good. Don’t worry about the Yamaha, it’s an excellent unit. I’m partial to the Denons.
The Axioms are nice but why not add on to your BAs. I’d go with a different sub though, something from SVS, HSU, or Velodyne maybe.