Jet Li		- Ranma/Ryouga/Mousse

Couldn't agree more.. he's the patron saint of martial arts in my opinion,
Ranma would be the best option..

Donney Yen	- Mousse/Ranma/Kuno

i really don't know.. all i can remember of him was how much Michelle Yeoh
is better n him.. (Wing Chun)

Jackie Chan	- Soun/Ranma

Soun.. no one else..

Samo Hung	- Genma & Panda (actually, he's perfect for this role.)

again i must agree.. he's perfect for the role

Anita Mui	- Nodoka/Shampoo

hmm.. Nodoka just doesn't use her as much as she should be.. but i don't
picture her as Shampoo...

Michelle Yeoh - Shampoo/Akane/Ukyou/Kodachi

i think she'd do best as Shampoo or Ukyou.. cause Akane is nowhere nearly as
good as her..

Brigette Lin  - Kodachi/Nodoka

works well with either.. hard to say.. 

Personally i'd like to see Waise Lee as Ryouga
Stephen Chow (ok he's not known for martial arts.. but does Kuno need
any?!?) as Kuno
and if a younger Ranma is included (IE first encounter with Ukyo, Neko-ken)
it would have to be Tze Miu
maybe a Wu Ma cameo? as happosai? (naw he isn't small enough...)
Jacky Wu would make a good Mousse in my opinion..

with action directors like  Yuen Woo-Ping, Yuen Cheung-Yan, Yuen Sun-Yi,
Kuk Hin-Chiu, Corey Yuen Kwai, or Yuen Tak.
Directed by Yuen Woo, Corey Yuen, or if more artsy, Ronnie Yu.
Produced by Tsui Hark and no other.

directors is way too hard to sort through.. too many great ones...
but Tsui Hark definately..