What is the best dropbox compatible iPad app for MS office documents?

I'm a professional writer, I've tried out a bunch of these apps, and I prefer Dataviz’s Documents to Go Premium, which creates and edits Microsoft Office documents (Word, Excel, PowerPoint). The great thing about the Premium version (and justifies the extra $6 over the basic version) is that it connects with the Dropbox online storage service. Documents to Go does a good job of editing Word documents, including maintaining styles, etc.