seting a different sidebar content per page

My site is mostly based on pages, then one are for posts (the blog area).

I am interested in each page having a different content for the right side bar…

main content | right

Right now I want to try to have the right sidebar ‘change’ (for pages only). The ‘dream’ way would be that only pages and that I could add widgets instead of coding each sidebar version. I want to be able to choose the ‘version’/’content’ for each page’s sidebar.

Is it possible in 2.5.1.? Thank you in advance