Another good title is An Old-Fashioned Girl, even though Polly is slightly priggish. The girls have fun considering what was "old-fashioned" 150 years ago! Jack and Jill is okay, although the thought of two children being bed-ridden for an entire winter after a sledding accident strains the bounds of credulity. I never could finish Under the Lilacs, so don't have a copy in the library. The Inheritance, which was published fairly recently, goes over well with readers new to Alcott, but is rather different in style (more of a thriller), and I didn't care for it.
Some of these titles are difficult to find if you need to replace one in your library. The covers are uniformly blah, but I have to say, who on earth designed THIS one? Possibly the worst cover ever.