In my opinion everyone I have listed is important but I drew up a list of most important to least. This is just my opinion.To tell you the truth I would be dissapointed if any of the following werent included. But here goes

most important to least

1 Bill Murray/Dan Akroyd
2 Harold Ramis/Ivan Reitman
3 Sigourney Weaver
4 Rick Moranis
5 Ernie Hudson
6 Annie Potts
7 The Mayor (Lenny)
8 Slimer

columbia pictures to show the green light…

Here's mine, 1st to last:

1) Dan Aykroyd/Ray Stantz
2) Harold Ramis/Egon Spengler
3) Ernie Hudon/Winsto Zeddemore(in my script he has more screen time than Bill.
4) Rick Moranis/Louis Tully
5) Bill Murray/Peter Venkman
6) Lenny the Mayor.
7) Slimer
8) Annie Potts/Janine Melnitz (I didn't have her in my script at all!)

Its very unlikely the origional cast will have much screen time at this point. Its also not very likely that many of the origional cast or crew will participate in GB3 if it is made. Murray is very much against the idea. Reitman has stated he does not want to direct it (which could be for the best given the outcome of Evolution). If I had to pick one person it would be Dan Aykroyd because he cares the most about the franchise. I would also like to see Ramis help write the script along side of Aykroyd and perhaps direct it.

Im pretty sure Rick Moranis, Annie Potts, Ernie Hudson, Slimer, Dan Ackroyd, Harold Ramis would all love to come back and would not have a problem with it. The only two that concern me are Bill and Weaver (Dana). I dont think they want to do it. But oh well, that just sucks for them. We have to move on and let the ones with normal size egos come back and let new talent in.