I used OpenOffice a long time ago and it sucked so hard. Even being free wasn't enough to make me use it.
Just go to amazon.com and buy Office Home/Student version for $100. And be done with it. I don't know why people resist Microsoft products so much. Every now and then, they get something right. And Office is definitely one of those products.
If you don't anticipate sharing document files with others, then you can pretty much use whatever you want. Even Google Docs. It does the basics quite well. But if you're in an academic/business environment where you'll be swapping/editing each other's files, then I'd suggest getting whatever everyone else uses. (probably Office). That way, you won't run into weird compatibility/formatting issues.