I love Brooklyn Nine Nine, a show whose comedy succeeds despite (but also sometimes because of) Samberg.
I hadn't even considered he could be a Ghostbuster. Honestly I'd be cool with anyone, but I'd like to see someone who's not male and someone who's not white on the team (something I'd like to see more of in films in general, not specific to this one), so not just Seth Rogen and co. But I do love Jason Segel and think he'd do a great job as a sort of Ray "2". I dislike Amy Schumer but feel that she could handle a role with a good director and solid script locked down. Rebel Wilson could do well too.
I guess I just don't want people to be involved if they are not known for comedy. No Zach Efron types. No Robert Pattinson types. No Zooey Deschanel (sorry, you're beautiful, but no).
I kind of hope they don't bring up Ramis'/Egon's death (just in case somebody wants to add a disrespectful "where's his ghost" joke) unless one of the new team is his son or daugter and they use that person as the exposition spewer, and even then it'll have to be done smartly.
And I want to see Slimer.