Overall, OpenOffice would be my choice for a full-featured word processor. I might experiment with Dark Room to see if the lack of distractions really improves my productivity. Since my first professional computer was a Mac Plus, I really wanted to like AbiWord, but it doesn't perform well on my Windows 7 system. Although Jarte has a lot of good ideas, it's at a position on the functionality-versus-footprint scale that doesn't match my needs. Meanwhile, the current versions of Writer's Blocks and Rough Draft are both showing their age, but that could make them ideal or at least worth looking at for people still using older systems. As for the author's tools, while Scrivener has a clean, professional look and feel plus an excellent reputation in the Mac world, my personal requirements as a writer are better met by the structure and fill-in-the-blanks tools of WriteItNow.
Fortunately, all of these programs are at least free to try. Check out one or more of these Word alternatives, and you just might find the right wordsmithing tool for you.