One of the best sites for looking up Blu-ray player specifications has become http://www.blu-ray.com
. Recently they added a new search feature that lets you filter your search by more then 60 different parameters. Its not 100% accurate but it does a better job then any other site I've seen.
If you are thinking about getting a couple of Blu-ray players for testing this new search might be a good starting point. Give it a go at: http://www.blu-ray.com/products/search.php?p=1