Hopefully the mods can make this a sticky as it is extremely useful to anyone looking to spend top dollar on blu ray discs - and WANT quality films.
http://www.avsforum.com/avs-vb/showthread.php?t=1168342This thread outlays all the different quality tiers that Blu Ray comes in. And can help you to decide which ones to spend your money on!
Hope its useful to some of you.
Merlin.