I haven't really paid attention to any of the deals out there for BluRay because I never had a player. I've been extremely frugal on my standard DVD's and I think I've only paid full price for some of the Disney flicks I own.
What would be a good movie to "experiment" with the quality between a standard disc and BR? Heck - I'd just like to see what a DVD looks like upconverted. Still haven't hooked up my PS3 yet...
I would try Transformers. One of the best PQ around.
But the difference is really night and day. Its like watching a regular channel vs a High-def channel.