Best App for using MSFT Word/excel on your I-Phone?

Hello All, I was just wondering what everyone believes is the best application for viewing/editing Msft Word/Excel files on your I-Phone? I'm searching for an app that would allow me to do this without much success. It would be nice to be able to download files from my email/transfer them from drop-box to this application for viewing/editing. I would like to use drop-box to then transfer the files to and from my desktop/labtop computers. It would be helpful if this application also aloud one to print from your I-Phone in addition, but that would be icing on the cake. I'm really not asking for a lot...am I? Gosh, I feel like I should just create the thing myself! Any suggestions are greatly appreciated. Thank you. -Andrew-