BEST? Pages,Numbers,Keynote. The Mac version of the Office Suite really is horrible. It is also different enough to the windows version that you will be learning something new anyway, why not learn Mac specific programs?
Yes, it will be a little bit of a learning curve ( anything causes you trouble, just google it, it surely has caused the other millions of windows users the same trouble and probably well documented ). Once you start playing around with cloud storage, you will be hooked. I work on documents at work, save them, work on them at home without any thumb drives or emaily stuffy, stuff. I also work on them on my iPad when that is more convenient. All my documents are available and changes or updates are instantly available to all devices.
Yeah!