Fullmetal Alchemist: The Sacred Star of Milos: Part 1· Part 2
All of the episodes from both series and both films come with dual audio, which means you can watch it in English or Japanese with subtitles. Everything except the original 2003 series and the Sacred Star of Milos movie are 720p in quality.
When you download the Sacred Star of Milos, you will need to download both parts (.001, .002) and merge them using HJSplit. You can find a tutorial on how to use HJSplit here and the website to download it here.