Erica Durance is too "hot" to play Jennifer Walters. Jennifer Walters is more mousy and plain. Not unattractive, just not a showstopper. Of the gals on Smallville, Allison Mack is closer to Jennifer Walters in that respect (Okay, so I'd say she's actually pretty hot, but in Hollywood Casting terms she's the perfect "mousy and plain best friend". )

Besides, in casting Jennifer Walters they'd be better off with a relative unknown. She Hulk likes to be She Hulk all of the time. The more high profile an actress they cast as Jennifer, the more screen time she gets. The hotter the actress they cast as Jennifer, the more screen time she gets.

I'm afraid that even though there are actresses we know of who could do a great turn as a Jennifer Walters who's a supporting act or counterpoint to She Hulk, none of them should be cast. With Hulk. Hulk and Banner are equal leads. In She Hulk, Jennifer Walters is the character in the Pilot Episode who gets dropped for the regular series.

It's a bit thinking outside the box, maybe, but I think Tyra Banks would make a good She-Hulk -- she is sassy, extroverted, has shown she can act and is physically imposing enough to give it a go. Give her six-inch heels and cast everyone else short and you wouldn't even need to worry too much about forced perspective and the like.

edited to correct the spelling of 'physically' which I've managed to get wrong twice now...doh!

On the "is She-Hulk funny" sub-thread, JB made her funny. There was nothing particularly humorous about the character before her own series showed how to have fun with Jen and her world.

One of the things I really disliked about Peter David's run was that everything JB and Dan Slott did to make her fun and different was tossed aside in the first few pages of PAD's first issue.

But there is nothing intrinsically humorous about our green lady; it was JB that made her funny.

"But there is nothing intrinsically humorous about our green lady; it was JB that made her funny."

Not humorous. Not "she acts funny" or "she looks funny". She is funny, as in she's witty. She makes observations about herself and others around her that are clever, insightful and funny. And sometimes she lands in situations that are funny precisely because she's not a humorous but a serious character.  No-one's saying she's a clown. Spider-man is funny. He makes  a lot of jokes. She Hulk is funny in only a slightly different way.  

Except when Peter David writes her, of course. (Say aren't we about due an issue of She Hulk where he throws out a few "funny" lines about She Hulk wanting to have sex with the Hulk?)