The Oppo won't sound any different through your system. One important feature with the Oppo's is that the remotes are backlit and are better designed ergonomically, meaning ease of use and accessibility of information.
Point well made. One can only wonder what the situation is outside of Los Angeles relative to Barco Auro 3D, given just how important this particular market is and that it is the epi-center of Hollywood studios.
The answer is any of them. The question might be rephrased to which one(s) meet your criteria of what Auro 3D can and should be. And if any or all of the three theaters meet your standards, then why has Auro 3D fallen so far on its face with just a lot of excuses and not produced what the consumer should hear in an Auro 3D equipped and approved theater?
Pioneer Elite 62FD and the Panasonic BMP BDT-500 that are both at your $200 threshold. The Elite is a universal BR player, meaning that it will play SACD and DVD-A. The Panasonic BDT-500 is a 2012 player that will play dvd and blu-ray at 1.5X which is handy for going through commentary.