I've been lurking this morning, and I've read 95% of the posts, so let me state my opinion.
A big name actor would make Batman Begins better than a little known actor Thats just my opinion. We already know that the big name actors are good actors, and many of the little known actors(Hulme for instance) are good actors aswell. But my reason for thinking a big name actor would boost the film was because of Batman 89. Michael Keaton, nobody really knew him as a well known actor. Jack Nicholson, a well known actor, the best of the best, eerybody knew him back in the 80s, heh, and the 70s.
Now lets move on to Hugo Weaving. He'd be an awesome choice for The Joker. I love the shape of his head

He's also got great teeth, and an evil smile, as we saw in Revolutions after The Oracle became an Agent.
Now on to screen time.
I'd be heartbroken if The Joker got the same airtime as in Doc Ock in SM-2. I'd actually cry after the movie. The theater might be flooded with my tears. Doc Ock was cheated out of airtime, and should have had much more, but I could deal with it, because the way they portraited him wasn't the best way. A scientist gone crazy who just wants to make a machine that can control the sun, blah, blah, blah. Now The Joker should have a huge part as he did in Batman 89. The 2nd main character should definetly not be Alfred or Gordon. Socko is right. Scarecrow wasn't a main villian, so his airtime was perfect IMO.
*Finishes rant*
