I agree. Peter Sellers was really funny. I really liked Tom Hanks' older films like The 'Burbs, that's one of my favourites from him. I was glad to see him come back to comedy this year, he was brilliant in Ladykillers.
As for Bill Murray, he's definitely one of the best, Groundhog Day, Caddyshack, Scrooged, Ghostbusters...were all really funny.
But my favourite funny man after Jim has to be Steve Martin, I think he's excellent.