Their's a reason The Hulk's cast is mainly unknown.
Nick Nolte, Sam Elliot and Jennifer Connelly aren't exactly unknowns... but you're right - they aren't overpaid stars [*cough* Val Kilmer, Michael Keaton, George Clooney *cough*] like some other movies had.
BTW - Eric Bana kicked @ss in Black Hawk Down. Josh Lucas made a pretty good name for himself in A Beautiful Mind [hmm - another Jennifer Connelly connection]. Brooke Langton you will probably recognize as one of the hot chicks in the trailer in Swingers or as Keanu Reeves' love interest in The Replacements [sorry to admit I watched this movie]. Lou Ferrigno makes an appearance in this [grin].
Lastly, the special fx are being done by ILM. So, you KNOW they are going to rock!