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I am looking for the same. It would already help if there was a converter between RTF and Pages, so that I could convert my existing RTFs to .pages files on the iPhone/iPad, edit them in Pages, then convert them back to RTF and store them again in my Dropbox.
I think you're looking for something like Textastic, which can sync with Dropbox, FTP, SFTP, etc and does code highlighting for code & markup and has a customizable keyboard area.